A frequency table of grades has five classes (A, B, C, D, F) with frequencies of 4, 10, 14, respectively. Using percentages, what are the relative frequencies of the five 8, and 2 classes? Complete th

Answers

Answer 1

The relative frequencies of the eight and two classes are 21.05% and 5.26%, respectively.

Given that, a frequency table of grades has five classes (A, B, C, D, F) with frequencies of 4, 10, 14, respectively.

Using percentages, we have to find the relative frequencies of the five 8, and 2 classes.

Complete the following table: Class Frequency Percentage Relative Frequency

A 4

B 10

C 14

D  Eight  

F  Two Total

We can get the total by adding all the frequencies.

The total is: Total = 4 + 10 + 14 + 8 + 2 = 38We can find the percentage by using the formula given below:

Percentage = (Frequency / Total) × 100Substituting the values in the above formula, we get the following table:

Class Frequency Percentage    Relative Frequency

A              4                10.53%                       10.53%

B              10        26.32%                      26.32%

C              14       36.84%

__                  --                   --                                        --

Total 38 100.00% 100.00%

Hence, the relative frequencies of the eight and two classes are 21.05% and 5.26%, respectively.

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Related Questions

2 Which statistical tool defines the prediction for the dependent variable? (1 Point) Correlation O Regression O t-test Confidence Interval

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The statistical tool that defines the prediction for the dependent variable is regression. Regression analysis is a statistical tool that defines the prediction for the dependent variable.

Regression analysis is used to examine the relationship between one dependent variable (usually denoted as Y) and one or more independent variables (usually denoted as X). It involves the calculation of the equation that best describes the relationship between these variables.

The equation is then used to make predictions about the dependent variable. Regression analysis is widely used in business, economics, and social science research to identify the factors that affect the outcome of a particular phenomenon.

For instance, a business can use regression analysis to determine how various factors such as advertising, price, and location affect the sales of a product. The results of the analysis can then be used to develop a marketing strategy that will increase the sales of the product. In conclusion, regression analysis is an important statistical tool that defines the prediction for the dependent variable.

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Find the exact value of each expression, if it is defined. Express your answer in radians. (If an answer is undefined, enter UNDEFINED.)
(a) sin (3)
(b) cos-4 - )
(C) tan (- 15).

Answers

a) The exact value of sin 3 in radians is 0.05233.

b) The exact value of cos-4 cannot be found.

c) The exact value of tan (-15) in radians is -sqrt(6) + sqrt(2).

(a) sin (3) :

Exact value of sin 3 in radians: We know that sin 3 is a value of a trigonometric function. We can find the exact value of sin 3 with the help of a trigonometric circle.

To calculate sin 3, we will divide the length of the opposite side of the triangle by the length of the hypotenuse. sin (3) = Opposite side / Hypotenuse = 0.05233

(b) cos-4

The value of cos-4 cannot be calculated without context. If -4 is the power of cosine function, then it can be calculated, and if -4 is the inverse of cosine function, then we need to be given an angle.

Hence, the exact value of cos-4 cannot be found with the given information.

(C) tan (- 15):

We know that: tan (- 15) = -tan 15

We can calculate tan 15 as we know that sin 15 = (sqrt(6) - sqrt(2))/4 and cos 15 = (sqrt(6) + sqrt(2))/4.

Then, tan 15 = sin 15/cos 15

Therefore, tan (- 15) = -tan 15 = -(sin 15/cos 15)

= -(sqrt(6) - sqrt(2))/(sqrt(6) + sqrt(2))

= -sqrt(6) + sqrt(2)

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how many integer solutions are there to 2x1 2x2 2x3 x4 x5 = 9 with xi ≥ 0?

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To find the number of integer solutions to the equation 2x1 + 2x2 + 2x3 + x4 + x5 = 9 with xi ≥ 0, we can use a technique called "stars and bars" or "balls and urns."

In this technique, we imagine distributing 9 identical balls (representing the total value of 9) into 5 distinct urns (representing the variables x1, x2, x3, x4, and x5). We can visualize this by placing dividers (represented by bars) between the balls to separate them into groups.

For this problem, we have 9 balls and 4 dividers (bars) since there are 5 variables (x1, x2, x3, x4, x5). So, we need to arrange these 9 balls and 4 dividers.

The total number of arrangements is given by (9 + 4) choose 4, or (9 + 4)! / (4! * 9!).

Calculating this, we get:

(9 + 4)! / (4! * 9!) = 13! / (4! * 9!)

= (13 * 12 * 11 * 10) / (4 * 3 * 2 * 1)

= 13 * 11 * 5

= 715

Therefore, there are 715 integer solutions to the equation 2x1 + 2x2 + 2x3 + x4 + x5 = 9 with xi ≥ 0.

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What is the equation of the parabola opening upward with a focus at and a directrix of ?
A. f(x) = 1/32(x - 9)^2 + 19 =
B. f(x) = 1/32(x + 9)^2 + 19 =
C. f(x) = 1/16(x - 9)^2 + 19 =
D. f(x) = 1/16(x + 9)^2 - 19 =

Answers

The equation of the parabola opening upward with a focus at and a directrix  is  f(x) = 1/32(x - 9)² + 19

Therefore option A  is correct.

How do we calculate?

Our objective is to find the equation of the parabola opening upward with a focus at (9, 19) and a directrix of y = -19

The standard form of the equation of a parabola with a vertical axis is:

4p(y - k) = (x - h)²

(h, k) = (9, 0)  we know this because the focus lies on the x-axis and the directrix is a horizontal line.

The distance between the vertex and the focus = 19.

4 * 19(y - 0) = (x - 9)²

76y = (x - 9)²

y = 1/76(x - 9)²

Comparing this equation to the options provided, we see that the likely answer is: A. f(x) = 1/32(x - 9)² + 19

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A stone is thrown upward from ground level. The initial speed is 176 feet per second. How high will it go?
a. 484 feet
b) 510 feet
c. 500 feet
d., 492 feet
e/. 476 feet

Answers

The correct option is D. The stone will go 492 feet high.

The maximum height (h) that a stone thrown upward from ground level would go with an initial velocity (u) of 176 feet per second can be determined using the formula for projectile motion.

The formula for projectile motion

h = u²/2g

Where u is the initial velocity and g is the acceleration due to gravity, which is 32 feet per second squared.

Substituting the values

h = (176)²/(2 × 32) = 492 feet

Therefore, the stone will go 492 feet high. Hence, option D is correct.

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Find The Radius Of Convergence, R, Of The Series
Sigma n=1 to infinity (n!x^n)/(1.3.5....(2n-1))
Find the interval, I, of convergence of the series. (Enter your answer using interval notation)

Answers

The radius of convergence, R, of the series is 1. The interval of convergence, I, is (-1, 1) in interval notation.

The ratio test can be used to find the radius of convergence, R, of the given series. Applying the ratio test, we take the limit as n approaches infinity of the absolute value of the ratio of the (n+1)th term to the nth term. In this case, the (n+1)th term is [tex]((n+1)!x^{(n+1)})/(1.3.5....(2n+1))[/tex], and the nth term is [tex](n!x^n)/(1.3.5....(2n-1))[/tex].

Simplifying the ratio and taking the limit, we find that the limit is equal to the absolute value of x. Therefore, for the series to converge, the absolute value of x must be less than 1. This means that the radius of convergence, R, is 1.

To determine the interval of convergence, we need to find the values of x for which the series converges. Since the radius of convergence is 1, the series converges for values of x within a distance of 1 from the center of convergence, which is x = 0. Therefore, the interval of convergence, I, is (-1, 1) in interval notation.

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find two power series solutions of the given differential equation about the ordinary point x=0: y′′ x2y′ xy=0.

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The two power series solutions of the given differential equation about the ordinary point x=0 are [tex]y1(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n) 〗 and y2(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n+1) 〗.[/tex]

The given differential equation is [tex]y′′ x²y′ xy = 0[/tex].

We must find two power series solutions of the given differential equation about the ordinary point x=0.

The power series solution of the differential equation is given by

[tex]y (x) = ∑_(n=0)^∞▒〖a_n x^n 〗[/tex]

Differentiating the equation w.r.t. x, we get

[tex]y′(x) = ∑_(n=1)^∞▒〖a_n n x^(n-1) 〗[/tex]

Differentiating again w.r.t. x, we get

[tex]y′′(x) = ∑_(n=2)^∞▒〖a_n n (n-1) x^(n-2) 〗[/tex]

Substitute the above expressions of y(x), y′(x), and y′′(x) in the differential equation:

[tex]y′′ x²y′ xy = ∑_(n=2)^∞▒〖a_n n (n-1) x^(n-2) 〗x^2[∑_(n=1)^∞▒〖a_n n x^(n-1) 〗]x[∑_(n=0)^∞▒〖a_n x^n 〗] = 0[/tex]

We can simplify the above expression to get:

[tex]∑_(n=2)^∞▒〖a_n n (n-1) a_(n-1) x^(n-1) 〗+ ∑_(n=1)^∞▒〖a_n x^n+1[/tex]

[tex]∑_(n=0)^∞▒〖a_n x^n 〗〗 = 0n = 0: a_0 x^2 a_0 = 0a_0 = 0n = 1: a_1[/tex]

[tex]x^2 a_0 + a_1 x^2 a_1 x = 0a_1 = 0 or a_1 = -1n ≥ 2: a_n x^2 a_(n-1) n(n-1) + a_(n-2) x^2 a_n = 0a_n = (-1)^n x^2 (a_(n-2))/n(n-1)[/tex]

Therefore, the two power series solutions of the given differential equation about the ordinary point x=0 are:

y1(x) = a_0 + a_1 x + (-1)^2 x^2(a_0)/2! + (-1)^3 x^3(a_1)/3! + ……= ∑_(n=0)^∞▒〖(-1)^n x^(2n) 〗y2(x) = a_0 + a_1 x + (-1)^3 x^3(a_0)/2! + (-1)^4 x^4(a_1)/4! + ……= ∑_(n=0)^∞▒〖(-1)^n x^(2n+1) 〗

The two power series solutions of the given differential equation about the ordinary point x=0 are

[tex]y1(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n) 〗 and y2(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n+1) 〗.[/tex]

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find the unique solution to the differential equation that satisfies the stated = y2x3 with y(1) = 13

Answers

Thus, the unique solution to the given differential equation with the initial condition y(1) = 13 is [tex]y = 1 / (- (1/4) * x^4 + 17/52).[/tex]

To solve the given differential equation, we'll use the method of separation of variables.

First, we rewrite the equation in the form[tex]dy/dx = y^2 * x^3[/tex]

Separating the variables, we get:

[tex]dy/y^2 = x^3 * dx[/tex]

Next, we integrate both sides of the equation:

[tex]∫(dy/y^2) = ∫(x^3 * dx)[/tex]

To integrate [tex]dy/y^2[/tex], we can use the power rule for integration, resulting in -1/y.

Similarly, integrating [tex]x^3[/tex] dx gives us [tex](1/4) * x^4.[/tex]

Thus, our equation becomes:

[tex]-1/y = (1/4) * x^4 + C[/tex]

where C is the constant of integration.

Given the initial condition y(1) = 13, we can substitute x = 1 and y = 13 into the equation to solve for C:

[tex]-1/13 = (1/4) * 1^4 + C[/tex]

Simplifying further:

-1/13 = 1/4 + C

To find C, we rearrange the equation:

C = -1/13 - 1/4

Combining the fractions:

C = (-4 - 13) / (13 * 4)

C = -17 / 52

Now, we can rewrite our equation with the unique solution:

[tex]-1/y = (1/4) * x^4 - 17/52[/tex]

Multiplying both sides by -1, we get:

[tex]1/y = - (1/4) * x^4 + 17/52[/tex]

Finally, we can invert both sides to solve for y:

[tex]y = 1 / (- (1/4) * x^4 + 17/52)[/tex]

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find the solution of the differential equation that satisfies the given initial condition. xy' y = y2, y(1) = −7

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The solution to the given differential equation [tex]\(xy' - y = y^2\)[/tex] that satisfies the initial condition (y(1) = -7) is (y = -7x).

What is the particular solution of the differential equation with the initial condition, where [tex]\(xy' - y = y^2\)[/tex] and (y(1) = -7)?

To solve the given differential equation [tex](xy' - y = y^2)[/tex] with the initial condition (y(1) = -7), we can use the method of separable variables.

First, we rearrange the equation by dividing both sides by [tex]\(y^2\):[/tex]

[tex]\[\frac{xy'}{y^2} - \frac{1}{y} = 1\][/tex]

Now, we separate the variables and integrate both sides:

[tex]\[\int \frac{1}{y}\,dy = \int \frac{1}{x}\,dx + C\][/tex]

where (C) is the constant of integration.

Integrating the left side gives:

[tex]\[\ln|y| = \ln|x| + C\][/tex]

Next, we can simplify the equation by exponentiating both sides:

[tex]\[|y| = |x| \cdot e^C\][/tex]

Since (C) is an arbitrary constant, we can combine it with another constant,[tex]\(k = e^C\):[/tex]

[tex]\[|y| = k \cdot |x|\][/tex]

Now, we consider the initial condition (y(1) = -7). Substituting (x = 1) and (y = -7) into the equation, we get:

[tex]\[-7 = k \cdot 1\][/tex]

Therefore, (k = -7).

Finally, we can write the solution to the differential equation with the initial condition as:

[y = -7x]

where (x) can take any value except (x = 0) due to the absolute value in the solution.

The solution to the given differential equation that satisfies the initial condition (y(1) = -7) is (y = -7x).

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Shadow A person casts the shadow shown. What is the approximate height of the person?

Answers

Answer:

height of person ≈ 6 ft

Step-by-step explanation:

using the tangent ratio in the right triangle.

let the height of the person be h , then

tan16° = [tex]\frac{h}{21}[/tex] ( multiply both sides by 21 )

21 × tan16° = h , then

h ≈ 6 ft ( to the nearest whole number )

A plane is headed due south at a speed of 298mph. A wind from direction 51 degress is blowing at 18 mph. Find the bearing pf the plane

Answers

To find the bearing of the plane, we will use the concept of vector addition. The process of adding two or more vectors together to form a larger vector is known as vector addition. If two vectors, A and B, are added, the resulting vector is the sum of the two vectors, and it is denoted by A + B.The plane is heading towards the south at a bearing of 24.68°.

The plane is flying towards south direction. So, we can assume that it has an initial vector, V, in the south direction with a magnitude of 298 mph. Also, the wind is blowing in the direction of 51° with a speed of 18 mph. So, the wind has a vector, W, in the direction of 51° with a magnitude of 18 mph.To find the bearing of the plane, we need to calculate the resultant vector of the plane and the wind.

Let's assume that the bearing of the plane is θ.Then, the angle between the resultant vector and the south direction will be (θ - 180°).Now, we can use the sine law to calculate the magnitude of the resultant vector.According to the sine law,`V / sin(180° - θ) = W / sin(51°)`

Simplifying this equation, we get:`V / sinθ = W / sin(51°)`Multiplying both sides by sinθ, we get:`V = W sinθ / sin(51°)`Now, we can calculate the magnitude of the resultant vector.`R = sqrt(V² + W² - 2VW cos(180° - 51°))`

Substituting the given values, we get:`R = sqrt((18sinθ / sin(51°))² + 18² - 2(18sinθ / sin(51°))18cos(129°))`Simplifying this equation, we get:`R = sqrt(324sin²θ / sin²51° + 324 + 648sinθ / sin51°)`

Now, we can differentiate this equation with respect to θ and equate it to zero to find the value of θ that minimizes R.`dR / dθ = (648sinθ / sin51°) / 2sqrt(324sin²θ / sin²51° + 324 + 648sinθ / sin51°) - (648sin²θ / sin²51°) / (2sin²51°sqrt(324sin²θ / sin²51° + 324 + 648sinθ / sin51°)) = 0`

Simplifying this equation, we get:`324sin²θ / sin⁴51° - 3sinθ / sin²51° + 1 = 0`Solving this equation, we get:`sinθ = 0.4078`Therefore, the bearing of the plane is:`θ = sin⁻¹(0.4078) = 24.68°`

So, the plane is heading towards the south at a bearing of 24.68°.

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1-- Voters in a particular city who identify themselves with one or
the other of two political parties were randomly selected and asked
if they favor a proposal to allow citizens with proper license

Answers

The aim of the study is to determine whether the majority of voters in the city supports a proposal to allow licensed citizens to carry weapons in public areas.

In order to do so, voters who identified themselves with one or the other of two political parties were randomly selected, and they were asked if they favor the proposal.It is essential to ensure that the sample size is adequate, and the sample is representative of the entire population. The sample size should be large enough to reduce the chances of errors and to increase the accuracy of the results. The sample must be representative of the entire population so that the results can be generalized. This ensures that the sample accurately reflects the opinions of the entire population.

There are several potential biases to consider when conducting this study.

For example, people who do not identify with either of the two political parties may have different views on the proposal, and the study would not capture their opinions.

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which event most contributed to the changing troop levels shown in this graph? The Twenty-Sixth Amendment lowered the draft age to 18 from 21.
U.S. and North Vietnamese ships exchanged fire in the Gulf of Tonkin.
Congress expanded presidential powers to wage war under the War Powers Act.
Communist troops launched a series of attacks during the Tet Offensive.

Answers

The event that most contributed to the changing troop levels shown in the graph is when Communist troops launched a series of attacks during the Tet Offensive.

The Communist troops launched a series of attacks during the Tet Offensive to try to undermine American and South Vietnamese morale, cause a general uprising and seize control of the cities in South Vietnam.

However, this didn't go as planned, since the Communist troops suffered devastating losses on the battlefield.

The Tet Offensive, which was one of the most important turning points in the Vietnam War, led to changes in troop levels that are shown on the graph.

The Tet Offensive significantly increased troop levels because American forces had to respond with more soldiers and resources to defend against the attacks.

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The event which most contributed to the changing troop levels shown in the graph was the Communist troops launching a series of attacks during the Tet Offensive.

The Tet Offensive was a series of attacks on the cities and towns of South Vietnam by the People's Army of Vietnam (PAVN) (also known as the North Vietnamese Army or NVA) and the National Liberation Front of South Vietnam (NLF), commonly known as the Viet Cong.

The Tet Offensive began in the early hours of 30th January 1968, during the Vietnam War. This event had a significant impact on public opinion and led to the escalation of the war.The graph in question, which depicts the troop levels, demonstrates that there was a considerable rise in US troop numbers during the years leading up to the Tet Offensive.

Following this event, troop numbers rose even higher before declining in the years that followed.

Therefore, the Communist troops launching a series of attacks during the Tet Offensive contributed most to the changing troop levels shown in the graph.

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I am getting solution wrong and
the third attempt is the last attempt.
Problem #1: Solve the following initial value problem. x= -13y₁ + 4y2 1/₂ = -24y₁ + 7y₂ y₁ (0) = 5, y₂(0) = 2. Enter the functions y₁(x) and y₂(x) (in that order) into the answer box b

Answers

(2/3)e^(5x) + (4/3)e^(-4x) is correct for given initial value problem. x= -13y₁ + 4y2 1/₂ = -24y₁ + 7y₂ y₁ (0) = 5, y₂(0) = 2.

To solve the initial value problem

`x = -13y₁ + 4y₂ 1/2 = -24y₁ + 7y₂; y₁ (0) = 5, y₂(0) = 2`,

we first need to find the solution of the system of differential equations.

The solution is given by:

y₁(x) = (19/3)e^(5x) + (5/3)e^(-4x)y₂(x)

= (2/3)e^(5x) + (4/3)e^(-4x)

Therefore, the functions y₁(x) and y₂(x) are:

y₁(x) = (19/3)e^(5x) + (5/3)e^(-4x)y₂(x)

= (2/3)e^(5x) + (4/3)e^(-4x)

Note: As per the given information, the third attempt is the last attempt. If you have already used two attempts and the solution is incorrect, please make sure to check your calculations and try again before using the last attempt.

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Find the measurement of the following angles if arc ED is 72 degrees, and CD is the diameter,

A. CED=?
B. ECD=?
C. CDE ?
D. CAB ?
E. DAB=?

Answers

Arc ED is 72 Degrees-A)CED = 72 degrees ,B)ECD = 36 degrees ,C)CDE = 144 degrees, D)CAB = 90 degrees .E)DAB = 90 degrees

The measurements of the angles in the given scenario, we need to apply the properties of angles in a circle.

Given:

- Arc ED is 72 degrees.

- CD is the diameter of the circle.

Using the properties of angles formed by a chord and an arc, we can determine the measurements of the angles as follows:

A. CED:

The angle CED is formed by the arc ED. Since arc ED is given as 72 degrees, the measurement of angle CED is also 72 degrees.

B. ECD:

Angle ECD is an inscribed angle that intercepts arc ED. By the inscribed angle theorem, the measure of an inscribed angle is half the measure of the intercepted arc. Therefore, angle ECD is half of 72 degrees, which is 36 degrees.

C. CDE:

Angle CDE is formed by the chord CD. It is an opposite angle to angle ECD. Since the sum of opposite angles formed by a chord is always 180 degrees, angle CDE is also 180 - 36 = 144 degrees.

D. CAB:

Angle CAB is formed by the diameter CD. When a diameter of a circle creates an angle with any other point on the circle, the angle is always a right angle (90 degrees). Therefore, angle CAB is 90 degrees.

E. DAB:

Angle DAB is an inscribed angle that intercepts arc CD. Since CD is the diameter of the circle, the intercepted arc CD is a semicircle, which has a measure of 180 degrees. By the inscribed angle theorem, angle DAB is half of 180 degrees, which is 90 degrees.

To summarize:

A. CED = 72 degrees

B. ECD = 36 degrees

C. CDE = 144 degrees

D. CAB = 90 degrees

E. DAB = 90 degrees

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determine the slope of the tangent line to the curve x(t)=2t3−1t2 6t 4y(t)=9e6t−6 at the point where t=1.

Answers

The slope of the tangent line to the curve at the point where t = 1 is 9.

To determine the slope of the tangent line to the curve defined by the parametric equations x(t) = 2t^3 - t^2 + 6t and y(t) = 9e^(6t - 6) at the point where t = 1, we can use the concept of differentiation.

First, let's find the derivative of x(t) and y(t) with respect to t:

dx(t)/dt = d/dt (2t^3 - t^2 + 6t)

= 6t^2 - 2t + 6

dy(t)/dt = d/dt (9e^(6t - 6))

= 54e^(6t - 6)

Next, we need to evaluate these derivatives at t = 1:

dx(1)/dt = 6(1)^2 - 2(1) + 6

= 6

dy(1)/dt = 54e^(6(1) - 6)

= 54e^0

= 54

Now, we have the slope of the tangent line at t = 1, which is given by dy(1)/dx(1). So, let's calculate that:

dy(1)/dx(1) = dy(1)/dt / dx(1)/dt

= 54 / 6

= 9

Therefore, the slope of the tangent line to the curve at the point where t = 1 is 9.

It's important to note that the slope represents the rate of change of y with respect to x at that specific point on the curve.

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use the definition of taylor series to find the taylor series (centered at c) for the function. f(x) = 7 sin x, c = 4

Answers

The Taylor series is a way to represent a function as a power series of its derivatives at a specific point in the domain. It is a crucial tool in calculus and its applications. The Taylor series for a function f(x) is given by:$$f(x) = \sum_{n=0}^\infty \frac{f^{(n)}(c)}{n!}(x-c)^n$$Where f^(n) (c) is the nth derivative of f evaluated at c.

In this case, we are asked to find the Taylor series centered at c=4 for the function f(x)=7sin(x).We first find the derivatives of f(x). The first four derivatives are:$f(x)=7sin(x)$;$f'(x)=7cos(x)$;$f''(x)=-7sin(x)$;$f'''(x)=-7cos(x)$;$f''''(x)=7sin(x)$;Notice that the pattern repeats after the fourth derivative. Thus, the nth derivative is:$f^{(n)}(x)=7sin(x+\frac{n\pi}{2})$Now, we can use the formula for the Taylor series and substitute in the derivatives evaluated at c=4:$f(x)=\sum_{n=0}^\infty \frac{7sin(4+\frac{n\pi}{2})}{n!}(x-4)^n$.

Thus, the Taylor series for f(x)=7sin(x) centered at c=4 is:$$7sin(x)=\sum_{n=0}^\infty \frac{7sin(4+\frac{n\pi}{2})}{n!}(x-4)^n$$.

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a) Suppose we were not sure if the distribution of a population was normal. In which of the following circumstances would we NOT be safe using a t procedure?
A. A histogram of the data shows moderate skewness.
B. The mean and median of the data are nearly equal.
C. A stemplot of the data has a large outlier.
D. The sample standard deviation is large.

Answers

The t procedure should not be used when there is a large outlier in the data or when the distribution shows moderate skewness. In these circumstances, the t procedure may not provide accurate results.

The t procedure assumes that the data is normally distributed. However, it can still be used under certain deviations from normality. The t procedure is robust to small departures from normality, so in the case of moderate skewness (option A), it can still provide reasonably accurate results. Skewness refers to the asymmetry of the distribution, and if it is only moderately skewed, the t procedure can be used.

However, there are situations where the t procedure should not be used. One such circumstance is when there is a large outlier in the data (option C). An outlier is an extreme value that differs significantly from the other observations. Large outliers can have a significant impact on the results of the t procedure, as it is sensitive to extreme values. In such cases, using the t procedure may lead to biased estimates or incorrect inferences.

Additionally, the sample standard deviation being large (option D) does not necessarily make the t procedure inappropriate. The t procedure is designed to handle variability in the data, including cases with larger standard deviations. As long as the other assumptions of the t procedure, such as normality and independence, are met, it can still be used effectively.

In summary, the t procedure should not be used when there is a large outlier in the data or when the distribution shows significant skewness. These situations can undermine the assumptions of the t procedure and may lead to inaccurate results.

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While performing a certain task under simulated weightlessness, the pulse rate of 12 astronauts increase on the average by 27.33 per minute with a standard deviation of 4.28 beats per minute. Construct a 99% confidence interval for o2, the true variance the increase in the pulse rate of astronauts performing a given task (under stated conditions). a. [7.53, 77.41] b. [8.53, 78.41] c. [9.53, 79.41] d. [10.53, 80.41] e. [11.53.81.411

Answers

The correct option is (a) [7.53, 77.41].

To construct a 99% confidence interval for the true variance (σ²) of the increase in pulse rate of astronauts performing a given task, we can use the Chi-Square distribution.

The formula for the confidence interval for the variance is:

[ (n-1) * s² / χ²_upper , (n-1) * s² / χ²_lower ]

Where:

n is the sample size

s² is the sample variance

χ²_upper and χ²_lower are the upper and lower critical values from the Chi-Square distribution, respectively, based on the desired confidence level and degrees of freedom (n-1).

In this case, we have:

n = 12 (number of astronauts)

s² = (standard deviation)² = 4.28² = 18.2984

degrees of freedom = n - 1 = 12 - 1 = 11

critical values from the Chi-Square distribution for a 99% confidence level are χ²_upper = 26.759 and χ²_lower = 2.179

Now we can substitute these values into the formula to calculate the confidence interval:

[ (11 * 18.2984) / 26.759 , (11 * 18.2984) / 2.179 ]

Simplifying:

[ 7.531 , 77.414 ]

Therefore, the 99% confidence interval for the true variance (σ²) of the increase in the pulse rate of astronauts performing the given task is approximately [7.53, 77.41].

The correct option is (a) [7.53, 77.41].

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ind the average value of f over the region d.f(x, y) = 6xy, d is the triangle with vertices (0, 0), (1, 0), and (1, 9)

Answers

The function is f(x,y)= 6xy. The region D is a triangle with vertices (0,0), (1,0), and (1,9).The region D can be represented by the limits 0 ≤ x ≤ 1 and 0 ≤ y ≤ 9x.

Therefore, the average value of f over D is given by:[tex]$$\bar f=\frac{\int_D f(x,y) dA}{\int_D dA}$$$$\int_D[/tex] [tex]f(x,y)dA= \int_{0}^{1}\int_{0}^{9x}6xydydx$$$$=\int_{0}^{1}3x(9x)^2dx$$$$=[/tex][tex]243/4$$[/tex]and the area of the region D is: $$\int_D dA = [tex]\int_{0}^{1}\int_{0}^{9x}dydx$$$$=\int_{0}^{1}9xdx$$$$=9/2$$[/tex]Therefore, the average value of f over D is[tex]:$$\bar f=\frac{\int_D f(x,y) dA}{\int_D dA}$$$$= \frac{243/4}{9/2}$$$$=27/2$$[/tex]Therefore, the average value of f over D is 27/2.

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the two-way table shows the results of a recent study on the effectiveness of the flu vaccine. what is the probability that a randomly selected person who tested positive for the flu is vaccinated?

Answers

The probability that a randomly selected person who is tested positive is vaccinated is: 0.4895

We are given a two-way frequency table that represents the result of a recent study on the effectiveness of the flu vaccine.

The table is as follows:

                                 Pos.              Neg.                Total

Vaccinated                465                771                   1236

Not vaccinated         485                 600                 1085  

Total                           950               1371                   2321

Now we are asked to find the probability that a randomly selected person who tested positive for the flu is vaccinated.

Let A denote the event that the person is tested positive.

Let B denote the event that he/she is vaccinated.

A∩B denote the event that the person tested positive is vaccinated.

Let P denote the probability of an event.

We are asked to find:

P(B|A)

We know that:

P (B|A) = P (A∩B) / P (A)

Here,

P (A∩B) = 465 / 2321

And, P (A) = 950 / 2321

Hence,

P (B|A) = P (A∩B) / P (A)

P (B|A) = 465 / 950

P (B|A) = 0.4895

Therefore, The probability that a randomly selected person who is tested positive is vaccinated is: 0.4895

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Please answer everything! thank you!
Probability S# 19xbo sluboM alomoss 7. A recent study of USF students found that 30 percent walk to class, 20 percent bike, and 12 percent do both. What is the percent of USF students who walk or bike

Answers

The percent of USF students who walk or bike is 38%.

Given that  Percent of students who walk to class is 30%

Percent of students who bike to class = 20%

Percent of students who do both (walk and bike) = 12%

To calculate the percent of students who walk or bike, we can use the principle of inclusion-exclusion.

We add the percentages of those who walk and bike and then subtract the percentage of those who do both.

Percent of students who walk or bike = Percent who walk + Percent who bike - Percent who do both

Percent of students who walk or bike = 30% + 20% - 12%

Percent of students who walk or bike = 50% - 12%

Percent of students who walk or bike = 38%

Therefore, the percent of USF students who walk or bike is 38%.

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Give examples of (a) A sequence (2n) of irrational numbers having a limit lim.In that is a rational number. (b) A sequence (rn) of rational numbers having a limit lim in that is an irrational number.

Answers

(a) A sequence (2n) of irrational numbers having a limit lim in that is a rational number:Consider the sequence (2n), where n is a positive integer. Here's the proof that this sequence converges to a limit, which is a rational number.

Observe that for every positive integer n, 2n can be written in terms of 2 as a power of 2, that is, 2n = 2^n. Since 2 is rational, so is 2^n. Therefore, (2n) is a sequence of irrational numbers having a limit that is a rational number, which is 0 when n approaches to negative infinity.(b) A sequence (rn) of rational numbers having a limit lim in that is an irrational number:Consider the sequence {rn} where rn = 1/n, n∈N.For every n∈N, rn is a rational number and lim (rn) = 0 which is an irrational number.

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The sequence 2, 2.8, 2.98, 2.998, 2.9998… is a sequence of irrational numbers which converges to a rational number 3.

The sequence (rn) is a sequence of rational numbers having a limit lim in that is an irrational number.

(a) A sequence (2n) of irrational numbers having a limit lim. In that is a rational number is:

There exist infinitely many sequences of irrational numbers, which converge to rational numbers.

Let us consider a sequence (2n) of irrational numbers, which converges to a rational number. 2, 2.8, 2.98, 2.998, 2.9998…

The sequence 2, 2.8, 2.98, 2.998, 2.9998… is a sequence of irrational numbers which converges to a rational number 3.

The limit of the sequence is 3, which is a rational number.

(b) A sequence (rn) of rational numbers having a limit lim in that is an irrational number:

One such example of a sequence (rn) of rational numbers having a limit lim in that is an irrational number is given below:

Consider the sequence (1 + 1/n)n, which is a sequence of rational numbers and converges to an irrational number e. The first few terms of the sequence are 2, 1.5, 1.33, 1.25, 1.2… and so on.

The limit of the sequence is e, which is an irrational number.

Thus, this sequence (rn) is a sequence of rational numbers having a limit lim in that is an irrational number.

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4. Use a calculator to solve the equation on the on the interval [0, 277). Round to the nearest hundredth of a radian. sin 3x = -sinx O A. 0, 1.57, 3.14, 4.71 OB. 0, 3.14 O C. 1.57, 4.71 O D. 0, 0.79,

Answers

In order to determine the values of x that meet the equation sin(3x) = -sin(x) on the interval [0, 277), we must first solve the sin(3x) equation.

We can proceed as follows using a calculator:

1. Enter sin(3x) = -sin(x) as the equation.

2. To isolate x, use the sine(-1) inverse function.

3. Find the value of x.

It's crucial to switch a calculator to radian mode before using it. After making the necessary computations, we discover that the equation's approximate solutions for the specified interval are:x ≈ 0, 1.57, 3.14, 4.71Consequently, the appropriate response isA. 0, 1.57, 3.14, 4.71

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If the 5th term of a geometric progression (GP) is 6.25 and the 7th term is 1.5625, determine the 1st term, and the common ratio. Select one: O a. a₁ = 10, r=0.5 O b. a₁ = -100, r = 0.5 Oca₁ = 100, r = ±0.5 O d. a₁ = 100, r = ±0.25

Answers

Answer:

[tex]\mathrm{a=10,\ r=0.5}[/tex]

Step-by-step explanation:

[tex]\mathrm{The\ nth\ term\ of\ any\ geometric\ sequence\ is\ given\ by:}\\\mathrm{t_n=ar^{n-1}}\\\mathrm{Given,}\\\mathrm{5th\ term(t_5)=6.25}\\\mathrm{or,\ ar^{5-1}=6.25}\\\mathrm{or,\ ar^4=6.25......(1)}\\\\\mathrm{And,\ 7th\ term(t_7)=1.5625}\\\mathrm{or,\ ar^{7-1}=1.5625}\\\mathrm{or,\ ar^6=1.5625.........(2)}[/tex]

[tex]\mathrm{Dividing\ equation(2)\ by\ (1),}\\\mathrm{\frac{ar^6}{ar^4}=\frac{1.5625}{6.25}}\\\\\mathrm{or,\ r^2=\frac{1}{4}}\\\\\mathrm{or,\ r=\frac{1}{2}}[/tex]

[tex]\mathrm{From\ equation(1)\ we\ have}\\\mathrm{ar^4=6.25}\\\mathrm{or,\ a(0.5)^4=6.25}\\\mathrm{or,\ a=100}[/tex]

Alternative method:

[tex]\mathrm{Here,\ the\ sixth\ term\ of\ the\ sequence\ is\ geometric\ mean\ of\ the\ 5th\ and\ 7th}\\\mathrm{term.}\\\mathrm{So,\ we\ may\ say:}\\\mathrm{t_6=\sqrt{t_5\times t_7}}=\sqrt{6.25\times 1.5625}=3.125\\\mathrm{Now,\ common\ ratio(r)=\frac{t_6}{t_5}=\frac{3.125}{6.25}=\frac{1}{2}=0.5}\\\mathrm{We\ know,\ t_6=3.125}\\\mathrm{or,\ ar^5=3.125}\\\mathrm{or,\ a(0.5)^5=3.125}\\\mathrm{or,\ a=100}[/tex]

The first term and common ratio of the geometric progression (GP) can be determined based on given information. First term (a₁) is 100, and the common ratio (r) is ±0.5, leading to correct answer c. a₁ = 100, r = ±0.5.

By analyzing the values of the 5th and 7th terms, we can find the relationship between them and solve for the unknowns. The correct answer is c. a₁ = 100, r = ±0.5. In a geometric progression, each term is obtained by multiplying the previous term by a constant ratio. Let's denote the first term as a₁ and the common ratio as r. Based on the given information, the 5th term is 6.25 and the 7th term is 1.5625.

Using the formula for the nth term of a geometric progression, we can express these terms in terms of a₁ and r:

a₅ = a₁ * r⁴ = 6.25

a₇ = a₁ * r⁶ = 1.5625

To solve for a₁ and r, we can divide the equations:

(a₇ / a₅) = (a₁ * r⁶) / (a₁ * r⁴)

1.5625 / 6.25 = r²

0.25 = r²

Taking the square root of both sides, we have:

r = ±0.5 Substituting the value of r back into one of the equations, we can solve for a₁:

6.25 = a₁ * (0.5)⁴

6.25 = a₁ * 0.0625

a₁ = 6.25 / 0.0625

a₁ = 100

Therefore, the first term (a₁) is 100, and the common ratio (r) is ±0.5, leading to the correct answer c. a₁ = 100, r = ±0.5.

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Can u please help in 30 mins

Answers

Answer:

[tex]\sf 3\:\dfrac{1}{5}\;miles[/tex]

Step-by-step explanation:

To find the total distance Eloise rides her bike, we need to add the distances she rode on Wednesday and Thursday.

First, convert the mixed numbers into improper fractions by multiplying the whole number by the denominator of the fraction, adding this to the numerator of the fraction, and placing the answer over the denominator.

[tex]\sf Wednesday: \quad 1 \frac{7}{10}\; miles=\dfrac{1 \cdot 10+7}{10}=\dfrac{17}{10}\; miles[/tex]

[tex]\sf Thursday: \quad 1 \frac{5}{10}\; miles=\dfrac{1 \cdot 10+5}{10}=\dfrac{15}{10}\; miles[/tex]

Add the two distances together.

As the denominators of the two fractions are the same, we simply add the numerators:

[tex]\sf \dfrac{17}{10}+\dfrac{15}{10}=\dfrac{17+15}{10}=\dfrac{32}{10}[/tex]

Simplify the improper fraction by dividing the numerator and denominator by 2:

[tex]\sf \dfrac{32 \div 2}{10 \div 2}=\dfrac{16}{5}[/tex]

Convert the improper fraction into a mixed number by dividing the numerator by the denominator:

[tex]\sf \dfrac{16}{5}=3\;remainder \;1[/tex]

The mixed number answer is the whole number and the remainder divided by the denominator:

[tex]3\frac{1}{5}[/tex]

Therefore, Eloise rides her bike a total of 3 1/5 miles.

Does the function satisfy the hypotheses of the Mean Value Theorem on the given interval? f(x) = x/ x + 6 , [1, 12]]

Answers

The function f(x) = x/(x + 6) does satisfy the hypothesis of the Mean Value Theorem on the given interval [1, 12].

To determine if the function satisfies the hypothesis of the Mean Value Theorem, we need to check two conditions: continuity and differentiability on the interval [1, 12].

Continuity: The function f(x) = x/(x + 6) is continuous on the interval [1, 12] because it is a rational function and the denominator (x + 6) is nonzero for all x in the interval.

Differentiability: The function f(x) = x/(x + 6) is differentiable on the interval (1, 12) since it is a quotient of two differentiable functions.

The derivative of f(x) can be calculated using the quotient rule, which yields f'(x) = 6/(x + 6)². The derivative is defined and nonzero for all x in the interval (1, 12).

Since the function is continuous on [1, 12] and differentiable on (1, 12), it satisfies the hypothesis of the Mean Value Theorem on the given interval.

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The joint density function of X and Y is given by f(x, y) = xe¯²(y+¹) for x > 0, y > 0. (a) Find the conditional density of X, given Y = y, and that of Y, given X = x. (b) Find the density function

Answers

a. the conditional density of X given Y = y is 0, which means that X and Y are independent.

b.  the density function of Z = X + Y is:

f(Z) = d/dZ [f(V)]

= d/dZ [(1/2)e^(-2)V^2]

= (1/2)e^(-2)(Z^2)

(a)

To find the conditional density of X given Y = y, we use the formula:

f(X | Y = y) = f(X, Y)/f(Y)

where f(Y) is the marginal density function of Y.

First, we find the marginal density function of Y:

f(Y) = ∫ f(X, Y) dx (from x=0 to infinity)

= ∫ xe^(-2)(y+1) dx (from x=0 to infinity)

= e^(-2)(y+1) ∫ x dx (from x=0 to infinity)

= e^(-2)(y+1) [x^2/2] (from x=0 to infinity)

= infinity (since the integral diverges)

Since the integral diverges, we know that f(Y) cannot be a valid probability density function. However, we can still proceed to find the conditional density of X given Y = y:

f(X | Y = y) = f(X, Y)/f(Y)

= xe^(-2)(y+1) / infinity

= 0

So the conditional density of X given Y = y is 0, which means that X and Y are independent.

Similarly, to find the conditional density of Y given X = x, we use the formula:

f(Y | X = x) = f(X, Y)/f(X)

where f(X) is the marginal density function of X.

First, we find the marginal density function of X:

f(X) = ∫ f(X, Y) dy (from y=0 to infinity)

= ∫ xe^(-2)(y+1) dy (from y=0 to infinity)

= x/e^2 ∫ e^(-2)y dy (from y=0 to infinity)

= x/e^2 [e^(-2)y/-2] (from y=0 to infinity)

= xe^(-2)/2

Now we can find the conditional density of Y given X = x:

f(Y | X = x) = f(X, Y)/f(X)

= xe^(-2)(y+1)/[x e^(-2)/2]

= 2(y+1)/x

= 2/x * (y+1)

So the conditional density of Y given X = x is a function of y that depends on x.

(b)

To find the density function of Z = X + Y, we use the transformation method. We need to find the joint density function of U = X and V = X + Y, and then integrate over all possible values of U to get the marginal density function of V.

First, we need to find the inverse transformation functions:

X = U

Y = V - U

The Jacobian determinant of the transformation is:

J = |d(x,y)/d(u,v)| = |[∂x/∂u ∂x/∂v; ∂y/∂u ∂y/∂v]|

= |[1 0; -1 1]|

= 1

So the joint density function of U and V is:

f(U,V) = f(X,Y) * |J| = xe^(-2)(V-U+1)

We want to find the marginal density function of V:

f(V) = ∫ f(U,V) dU (from U=0 to V)

= ∫ xe^(-2)(V-U+1) dU (from U=0 to V)

= e^(-2)V ∫ x dx (from x=0 to V) + e^(-2) ∫ x dx (from x=V to infinity) + e^(-2) ∫ dx (from x=0 to V)

= e^(-2)V [V^2/2 - V^3/6] + e^(-2) [(x^2/2)] (from x=V to infinity) + e^(-2)V

= (1/2)e^(-2)V^3 - (1/6)e^(-2)V^3 + (1/2)e^(-2)V

+ (e^(-2)/2)(V^2 - 2V(V+1) + (V+1)^2) + e^(-2)V

= (1/2)e^(-2)V^2

So the density function of Z = X + Y is:

f(Z) = d/dZ [f(V)]

= d/dZ [(1/2)e^(-2)V^2]

= (1/2)e^(-2)(Z^2)

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5 people are sitting around a table. Let x be the number of people sitting next to at least one woman and y be the number of people sitting next to at least one man. How many possible values of the ordered pair (x,y) are there? (For example, (5,0) is the pair if all 5 people are women, since all 5 people are sitting next to a woman, and 0 people are sitting next to a man.)

Answers

Let's consider the possible scenarios for the arrangement of the 5 people around the table in terms of their gender. Since there are only two genders, namely men and women, we can have the following cases:

All 5 people are women: In this case, each woman is sitting next to 4 other women, so x = 5 and y = 0. Therefore, the ordered pair is (5, 0).

4 people are women, and 1 person is a man: In this scenario, each woman is sitting next to 3 other women and the man. Thus, x = 4 and y = 1. The ordered pair is (4, 1).

3 people are women, and 2 people are men: In this case, each woman is sitting next to 2 other women and both men. Therefore, x = 3 and y = 2. The ordered pair is (3, 2).

2 people are women, and 3 people are men: Here, each woman is sitting next to 1 other woman and both men. Hence, x = 2 and y = 3. The ordered pair is (2, 3).

1 person is a woman, and 4 people are men: In this scenario, the woman is sitting next to all 4 men. So, x = 1 and y = 4. The ordered pair is (1, 4).

All 5 people are men: In this case, each man is sitting next to 4 other men, so x = 0 and y = 5. The ordered pair is (0, 5).

To summarize, we have the following possible ordered pairs: (5, 0), (4, 1), (3, 2), (2, 3), (1, 4), and (0, 5). Therefore, there are six possible values for the ordered pair (x, y).

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y=3x-7 Work out the value of y when x=5

Answers

Step-by-step explanation:

you know how functions work ?

the variable (or variables) in the findings expression is a placeholder for actual values.

when we have an actual value, we put that into the place of the variable and then simply calculate.

x = 5

therefore, the functional calculation is

y = 3×5 - 7 = 15 - 7 = 8

keep in mind the priorities of mathematical operations :

1. brackets

2. exponents

3. multiplications and divisions

4. additions and subtractions

therefore, we need to calculate "3×5" before we deal with the "- 7" part.

Answer:

Step-by-step explanation:

y=8

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A portion of host DNA is exchanged for phage DNA 4. Detached DNA replicates 5. Phage replication is completed and cell lyses Question 14 1 pts Which equation is used in the Silver-Meal Heuristic? =1 c, 0-1) DO) + .) c,4 0-1) DO) C+IC Ja1 T O 2C. ICD Question 14 1 pts Which equation is used in the Silver-Meal Heuristic? =1 c, 0-1) DO) + .) c,4 0-1) DO) C+IC Ja1 T O 2C. ICD Asses factors that shape employee behavior Jurassic World had world-wide box office receipts of $1.66 billion. Suppose that Chris Pratt, the leading actor, had been offered a part in another movie and that to hire him for Jurassic World, the producer had to double his pay. What incentives would have changed? How might the changed incentives have changed the choices that people made? Chris Pratt might have had _____ incentive to make Jurassic World and the movie producer might have had an incentive to _______A. to same; hire an alternative actor B. a bigger; reduce the budget for supporting actors C. less; reduce the budget for supporting actors D. less; hire an alternative actor 1. A cargo ship sails from a point A on a bearing of 038T for 5km to a point B. At B the ship changes course and sails for 7km on a bearing of 158T to a point C. Find the distance AC and the bear The portion that curves to arch over the root of the left lung is called the b. Select the descending aorta (thoracic) from the left side menu. The descending aorta travels through the thorax and the abdomen. The thoracic portion extends from the lower border of the thoracic vertebra to the in the diaphragm. c. Name the two categories of branches from the thoracic aorta. d. Select the descending aorta (abdominal) from the left-side menu. A continuation of the thoracic aorta, the abdominal aorta begins at the diaphragm and ends at the body of the where it branches into the two e. Select the superior vena cava from the left side menu. This is formed by the joining of the two It enters at the top of the of the heart. What region is drained by the superior vena cava? f. Select the inferior vena cava from the left side menu. This is formed by the junction of the two at the level of the vertebra. What part of the body is drained by the inferior vena cava? Compare the function of eating/digestion/defecation in Dante (Ciacco the Pig is a good place to start), Rabelais, and Montaigne.Could someone give a little description please! Given that x < 5, rewrite 5x - |x - 5| without using absolute value signs. Suppose that last year, the 12-month interest rates for the Australia and the Greece are 2.4% and 9.8% respectively, and that the Australian dollar price of a euro is $1.39. Given this information, what was the percentage change in the exchange rate over the year? Round to two decimal places. Enter a number like 2% as "2.00" and not "0.02 Consider the following class definitions. public class ci { public ci) { /* implementation not shown */ } public void m1() { System.out.print("A"); } public void m2() { System.out.print("B"); } } public class C2 extends ci { public C2) { /* implementation not shown */ } public void m2() { System.out.print("C"); } } The following code segment appears in a class other than c or c2. ci objl = new C2(); obj1.m1(); obji.m2(); The code segment is intended to produce the output AB. Which of the following best explains why the code segment does not produce the intended output? What value of b^2 is needed for there to be exactly one real solution of a quadratic equation? Explain. Based on your experience as a worker/manager, please explain the importance of organizational structure and culture to work?Use the readings to aid you in this discussion. What types of problems do they solve/cause.Provide examples. the balance sheet columns of a work sheet show a total dr. of 44,000 and a total cr. of $40,000. which of the following must be true in this case? quizlet Compare disk block allocation schemes for different operations.A file consists of eight logical blocks, A through H.The current position is at the beginning of block E. The following operations are performed:read block D, read block F, delete block E, insert new block C' between C and D.For each of the four disk block allocation schemes, contiguous, linked, using FAT, and indexed, determine which blocks must be read from and written to the disk to perform each of the four operations. hich layer of soil is closest to the surface? a. o (organic matter) b. a (topsoil) c. b (subsoil) d. c (parent rock) which supreme court case outlawed the practice of the white primary?