Find the exact value of each expression,arc sin 1/2

Mr. Henry needs to buy 7 packages in total for his bar-b-q: 3 hotdog packages and 4 hamburger packages.

To determine the total number of packages Mr. Henry needs to buy, we will separately calculate the number of hotdog and hamburger packages required, then add them together.

First, let's find the number of hotdog packages needed. Since hotdogs come in packages of 8 and Mr. Henry wants 24 hotdogs:

Number of hotdog packages = Total hotdogs needed / Hotdogs per package
Number of hotdog packages = 24 / 8
Number of hotdog packages = 3

Next, let's find the number of hamburger packages needed. Since hamburgers come in packages of 6 and Mr. Henry wants 24 hamburgers:

Number of hamburger packages = Total hamburgers needed / Hamburgers per package
Number of hamburger packages = 24 / 6
Number of hamburger packages = 4

Now, to find the total number of packages Mr. Henry needs to buy, we will add the number of hotdog packages and hamburger packages:

Total packages = Hotdog packages + Hamburger packages
Total packages = 3 + 4
Total packages = 7

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Answer:

c. The value of n is equal to the exponent on the binomial.

Step-by-step explanation:

In the binomial theorem, the expression is of the form (a + b)^n, where a and b are constants and n is a non-negative integer, which represents the degree or the exponent of the binomial. The binomial theorem provides a formula for expanding this expression into a sum of terms involving powers of a and b, and the coefficients of these terms are given by the binomial coefficients. Therefore, the value of n is a crucial part of the binomial theorem and is equal to the exponent on the binomial.

To solve this problem, we can use the Chinese Remainder Theorem. We need to find the remainder when 2202 202 is divided by both 2101 and 251.

First, note that 2101 and 251 are relatively prime. Therefore, by the Chinese Remainder Theorem, there exists a unique remainder between 0 and 2101 * 251 - 1 (inclusive) that satisfies the two conditions.

To find this remainder, we can use the remainders when 2202 202 is divided by 2101 and 251.

Note that 2202 is congruent to 101 (mod 2101) and 0 (mod 251). Therefore, we can use the Chinese Remainder Theorem to find that the remainder when 2202 202 is divided by 2101 * 251 is congruent to:

101 * (251^2) * (251^(-1)) + 0 * (2101^2) * (2101^(-1)) (mod 2101 * 251)

Using the fact that 251^(-1) is congruent to 201 (mod 2101) and 2101^(-1) is congruent to 1922 (mod 251), we can simplify this expression to:

101 * (251^2) * (201) + 0 * (2101^2) * (1922) (mod 2101 * 251)

Simplifying further, we get:

101 * 251 * 201 (mod 2101 * 251)

This is congruent to 101 * 201 (mod 251), which is congruent to 101 (mod 251).

Therefore, the remainder when 2202 202 is divided by 2101 251 1 is 101, which is option (b).

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The labels of the y-axis of the graphs, and areas, and circumferences obtained based on the formula for the area and circumference of a circle are;

1. First part

First graph;

The y-axis label is; area (m²)

Second graph;

The y-axis label is; radius (m)

Third graph;

The y-axis label is; Circumference (m)

The area of a circle is; A = π × (D²)/4

The circumference of a circle is; C = π·D

The equation for the radius of a circle is r = D/2

The equation for the circumference of a circle is; C = π·D

The equation for the area of a circle is; A = π·D²/4

Therefore, equation for the radius and the circumference are straight line equation, with the slope of the equation for the circumference (π), being larger than the slope of the equation for the radius (1/2)

The variation of the area and the diameter is; A ∝ D², therefore, the shape of the graph for the area is a cup shaped parabola.

The label on the y-axis of the graphs are therefore;

First graph y-axis label is; Area (m²)

Second graph y-axis label is; Radius (m)

Third graph y-axis label is; Circumference (m)

Second part;

Area of circle A = 500 in²

Diameter of circle B = 3 × The diameter of circle A

Let D represent the diameter of circle A, we get;

Area of circle A = 500 in² = π·D²/4

D² = 4 × 500/π = 2000/π

The diameter of circle B = 3·D

Area of circle B = π·(3·D)²/4 = π·9·D²/4

π·9·D²/4 = π × 9 × (2000/π)/4 = 4,500

Third part;

The distance Lin's bike travels = 100 meters

Number of times the wheels rotate = 55 times

Fourth part;

The circumference of the circle Priya drew = 25 cm

Diameter of the circle Clare drew = 3 × The diameter of the circle Priya drew

The diameter of Priya's circle = 25/π

Diameter of Clare's circle = 3 × 25/π = 75/π

Circumference of Clare's circle = π × 75/π = 75

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Answer:

x=60 degrees

Step-by-step explanation:

Since they gave you the arc lengths, you have to add them all up and make it equal to 360, or write an equation:

(x+83)+(x+14)+(x+83)=360

then, first simplify the left side of the equation:

3x+180=360

then, subtract 180 from both sides:

3x=180

finally, divide both sides by 3:

x=60

So, x=60 degrees

Hope this helps! :)

To estimate the proportion of all new cell phone batteries that fail to last through a claimed number of charges, a consumer group will use a random sample and construct a percent confidence interval based on the proportion of batteries that fail to last through the charges in the sample.

To construct a confidence interval to estimate the proportion of all such batteries that fail to last through charges, the following steps can be followed:

Determine the sample size:

The consumer group should select a random sample of cell phones with the new battery and use the phones through charges of the battery.

The sample size should be determined based on the desired level of precision and confidence level.

A larger sample size will provide a more precise estimate.

Calculate the sample proportion:

The consumer group should record the proportion of batteries that fail to last through charges in the sample.

Calculate the standard error:

The standard error can be calculated using the formula:

[tex]SE = \sqrt{(p_hat * (1 - p_hat) / n) }[/tex]

where [tex]p_hat[/tex] is the sample proportion and n is the sample size.

Calculate the margin of error:

The margin of error can be calculated using the formula:

ME = z * SE

where z is the critical value from the standard normal distribution corresponding to the desired confidence level.

For example, if the desired confidence level is 95%, then z = 1.96.

Calculate the confidence interval: The confidence interval can be calculated using the formula:

[tex]CI = (p_hat - ME, p_hat + ME)[/tex]

This interval represents the range of values within which the true proportion of batteries that fail to last through charges is expected to fall with the desired level of confidence.

For example, suppose a random sample of 100 cell phones with the new battery is selected, and the proportion of batteries that fail to last through charges is found to be 0.10. If a 95% confidence level is desired, the standard error can be calculated as:

SE = [tex]\sqrt{(0.10 * 0.90 / 100)}[/tex] = 0.03

The margin of error can be calculated as:

ME = 1.96 * 0.03 = 0.06

The 95% confidence interval can be calculated as:

CI = (0.10 - 0.06, 0.10 + 0.06) = (0.04, 0.16)

Therefore, we can say with 95% confidence that the proportion of all such batteries that fail to last through charges is expected to be between 0.04 and 0.16.

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Answer:

Step-by-step explanation:

( a ± b )² = a² ± 2ab + b²

a² - b² = ( a - b )( a + b )

~~~~~~~~~~~~~~~  

y = ( x + 3 )² - 25

(a). y = ( x² + 6x + 9 ) - 25

     y = x² + 6x - 16

(b). y = ( x + 3 )² - 25

     y = ( x + 3 )² - 5²

     y = [ ( x + 3 ) - 5 ] [ ( x + 3 ) + 5 ]

     y = ( x - 2 )( x + 8 )

Using the piecewise defined function for f(x)={(2-4x if x<=1),(4x if 1=5):}, the values for f(x) are: - f(-2) = 10 - f(1) = -2 - f(2) = 8 - f(3) = 12 - f(8) is undefined.

To use the piecewise-defined function f(x) to find the given values, we need to use the following rules: -

If x is less than or equal to 1, then f(x) equals 2-4x. - If x is greater than 1 and less than or equal to 5, then f(x) equals 4x.

If x is greater than 5, then f(x) is undefined (since there is no rule given for this range of x).

Using these rules, we can find the values for f(x) as follows: - To find f(-2), we substitute -2 into the first rule: f(-2) = 2-4(-2) = 10. - To find f(1), we use the first rule again (since 1 is less than or equal to 1): f(1) = 2-4(1) = -2. - To find f(2), we use the second rule (since 2 is greater than 1 and less than or equal to 5): f(2) = 4(2) = 8

- To find f(3), we use the second rule again: f(3) = 4(3) = 12. - To find f(8), we note that 8 is greater than 5, so f(8) is undefined (since there is no rule given for this range of x).

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Answer:

Step-by-step explanation:

Pictograph

Pictograms are a powerful tool for visualizing data and are widely used in a variety of different fields, from marketing and advertising to science and education.

A pictogram is a type of chart that uses symbols instead of words or numbers to portray data. Pictograms are often used in data visualization and are particularly useful for presenting complex information in a simple and easily understandable way. Pictograms can be used to represent a wide range of data, including statistical information, demographic data, and geographical information. They are also commonly used in advertising and marketing, as they are a powerful tool for communicating ideas and concepts quickly and effectively. Pictograms can be created using a variety of different techniques, including hand-drawn illustrations, computer-generated graphics, and photographs. They are typically presented in a grid format, with each symbol representing a single data point. Pictograms can be used to show trends, compare data sets, and highlight key points. They are also a great way to make data more engaging and interactive, as users can explore the data by clicking on individual symbols or groups of symbols.

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The circumference, in feet of the parachute in discuss as required to be determined is; Choice C; 12pi feet.

It follows from the task content that the circumference, in feet of the parachute in discuss is to be determined.

Since the parachute is said to be circular, it's circumference is given by; C = 2pi × radius

Hence, since the radius is 6, we have that;

C = 2pi × 6 feet

C = 12pi feet.

Consequently, choice C; 12pi feet is correct.

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To find the area under the curve y = 1.5 x^-2.5 from x = 8 to x = t, a) Area ≈ 0.2455 b) Area ≈ 0.0816 c) Area = 3(8)^-1.5 + C

we need to integrate the function with respect to x.

The integral of y = 1.5 x^-2.5 is:

∫ 1.5 x^-2.5 dx = -3x^-1.5 + C

where C is the constant of integration.

To evaluate the definite integral from x = 8 to x = t, we plug in the upper and lower limits of integration and subtract the values:

Area = [-3t^-1.5 + C] - [-3(8)^-1.5 + C]

Simplifying this expression, we get:

Area = -3t^-1.5 + 3(8)^-1.5

Now we can find the area for t = 10 and t = 100:

(a) t = 10:

Area = -3(10)^-1.5 + 3(8)^-1.5

Area ≈ 0.2455

(b) t = 100:

Area = -3(100)^-1.5 + 3(8)^-1.5

Area ≈ 0.0816

To find the total area under the curve for x ≤ 8, we need to integrate the function from 0 to 8:

∫ 1.5 x^-2.5 dx = -3x^-1.5 + C

Area = [-3(8)^-1.5 + C] - [-3(0)^-1.5 + C]

Area = 3(8)^-1.5 + C

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The missing side lengths and the missing angles of the parallelogram are computed below

Given that we have

The opposite sides and angles of a paralleogram are equal

So, we have

CD = 17

AC = 9
CB = 17.5

TD = 10.5

Also, we have

ACD = 75

CDB = 105

CAB = 105

DBC = 45

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Answer: The distance between Bob's home and his school is 2.5 miles.

Step-by-step explanation:

What is speed?

Speed is the distance covered in unit time.

Speed of Bob = 3mph

Speed of his sister = 12mph

Distance between Bob's home and his school = distance covered by bob in 10 minutes + distance covered by his sister in 10 minutes.

Distance covered by Bob in 10 minutes = 3*10/60 = 0.5 mile.

Distance covered by His sister in 10 minutes = 12*10/60 = 2 miles.

So, the distance between Bob's home and his school =0.5+2 = 2.5miles.

Therefore, the distance between Bob's home and his school is 2.5 miles.

The equation of the ellipse is (x²/9) + (y²/4) = 1.

The center of the ellipse is at the origin, so we can use the standard form of an ellipse:

(x²/a²) + (y²/b²) = 1

where a denotes the semi-major axis length and b the semi-minor axis length The vertices of the ellipse are at (-a, 0) and (a, 0), and the co-vertices are at (0, -b) and (0, b).

In this case, the vertex is at (-3, 0), which means that the length of the semi-major axis is 3. The co-vertex is at (0, 2), which means that the length of the semi-minor axis is 2.

(x²/3²) + (y²/2²) = 1

Simplifying:

(x²/9) + (y²/4) = 1

So, the equation of the ellipse is (x²/9) + (y²/4) = 1.

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Given question is incomplete, the complete question is given below:

Write an equation of an ellipse in standard form with the center at the origin and with the given characteristics.

vertex at (-3,0) and co-vertex at (0, 2)

-1/28 is the average rate of change of f(x) from 8 to 64. Thus, option A is correct.

The f(x) function of the  

f(x)=−[tex]\sqrt[3]{x}[/tex]

the range is provided to lie between 8 and 64.

The function for 8 will be:

f(8)  =−[tex]\sqrt[3]{8\\}[/tex]

= -2

The function for 64 will be:

f (64)  =−[tex]\sqrt[3]{64\\}[/tex]

= - 4

The average is usually determined with the help of the intervals that are given:

The average function of (64,f(64)) and (8,f(8)); will be calculated as:

f = [tex]\frac{-4 - (-2)}{64 - 8}[/tex]

= -2 / 56

= -1 / 28

Therefore, option A is correct.

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The question is incomplete, Complete question probably will be  is:

Let f(x)=−x√3.

What is the average rate of change of f(x) from 8 to 64?

−1/28

1/28

−28

28

Part 1:  The partial fraction decomposition is  1/(1 + x) and 1/(1 + x²)

Part 2: the denominator into irreducible quadratic factor is  16x²(6x² + 1)(x² + 1).

In the first example, we are given the polynomial x² + 56x³ + x² and asked to write its partial fraction decomposition in the form of f(x)/(x+1) + g(x)/(x² + 1), where f(x), g(x) are polynomials.

To do this, we need to factor the polynomial into linear and irreducible quadratic factors. In this case, we can factor out an x² term to obtain

=> x²(1 + 56x + 1/x²).

We then use partial fraction decomposition to write

=> 1/(1 + x) and 1/(1 + x²)

as fractions with denominators (x+1) and (x²+1), respectively.

In the second example, we are asked to find the indefinite integral of the rational function

=> (4x³ + 10x² + 48x)/(96x⁴ + 16x²)

by first decomposing it into partial fractions.

To do this, we factor the denominator into irreducible quadratic factors, giving

=> 16x²(6x² + 1)(x² + 1).

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Using the convolution theorem, which states that the integral of the product of two functions is equal to the product of their individual integrals: ∫u^m(1-u)^n du = m! n! / (m+n+1)! Therefore, we have shown that: 1 ∫u^m(1-u)^n du = m! n! / (m+n+1)! 0

First, let's start by showing that f * g = t^(m+n+1) ∫u^m(1-u)^n du from the given functions f(t) and g(t). Using the definition of convolution, we have: f * g = ∫f(u)g(t-u)du

Substituting in our given functions: f * g = ∫u^m(t-u)^n dt We can simplify this integral by expanding (t-u)^n using the binomial theorem: f * g = ∫u^m(t^n - nt^(n-1)u + ... + (-1)^nu^n)dt

Now we can integrate term by term: f * g = ∫u^mt^n dt - n∫u^(m+1)t^(n-1)dt + ... + (-1)^n ∫u^(m+n)du Evaluating each integral, we get: f * g = t^(m+n+1) ∫u^m(1-u)^n du Which is what we wanted to show.

Now, we can use the convolution theorem to show that: 1 ∫u^m(1-u)^n du = m!n! / (m+n+1)! 0 The convolution theorem states that if F(s) and G(s) are Laplace transforms of f(t) and g(t), respectively, then the Laplace transform of f * g is simply F(s)G(s).

We know that the Laplace transform of t^m is m! / s^(m+1) and the Laplace transform of t^n is n! / s^(n+1). So the Laplace transform of f * g (using the result we just derived) is: F(s)G(s) = 1 / (s^(m+1) * s^(n+1)) * m!n! / (m+n+2) Simplifying: F(s)G(s) = m!n! / (s^(m+n+2) * (m+n+2)!)

We want to find the inverse Laplace transform of F(s)G(s) to get back to our original function. Using the formula for the inverse Laplace transform of 1/s^n, we get: f(t) = (t^(n-1) / (n-1)!) * u(t) (where u(t) is the unit step function)

So for F(s)G(s), we have: f(t) = m!n! / (m+n+2)! * t^(m+n+1) * u(t) Comparing this to the expression we derived earlier for f * g, we see that: 1 ∫u^m(1-u)^n du = m!n! / (m+n+1)! 0.

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Therefore, the vector ä = AB is (8, -2, 2). To find the vector ä = AB, we simply subtract the coordinates of point A from the coordinate

To find the vector AB (also denoted as vector ä) between the points A (-5, 1, 4) and B (3, -1, 6), we need to calculate the difference between the coordinates of point B and point A. This can be done using the formula: AB = (Bx - Ax, By - Ay, Bz - Az).

Using the given coordinates, we have:

Ax = -5, Ay = 1, Az = 4
Bx = 3, By = -1, Bz = 6

Now, we'll apply the formula to find the components of vector AB:

ABx = Bx - Ax = 3 - (-5) = 8
ABy = By - Ay = -1 - 1 = -2
ABz = Bz - Az = 6 - 4 = 2

So, the vector AB (or vector ä) is given by:

AB = (8, -2, 2)

Thus, the vector connecting points A and B has components (8, -2, 2).

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The volume of the solid obtained by rotating the region bounded by the curves about the axis y = -3 is (49π + 2)/72 cubic units.

To find the volume of the solid obtained by rotating the region bounded by the curves y = 0, y = cos(6x), and x = π/12, x = 0 about the axis y = -3, we can use the method of cylindrical shells.

To use the cylindrical shells method, we need to integrate the volume of each cylindrical shell. The volume of a cylindrical shell is given by:

V = 2πrhΔx

where r is the distance from the axis of rotation to the shell, h is the height of the shell, and Δx is the width of the shell.

In this case, the axis of rotation is y = -3, so the distance from the axis to a point (x, y) on the curve y = cos(6x) is r = y + 3. The height of the shell is h = x - 0 = x, and the width of the shell is Δx = π/12 - 0 = π/12.

Thus, the volume of each cylindrical shell is:

V = 2π(x)(cos(6x) + 3)(π/12)

To find the total volume, we need to integrate this expression from x = 0 to x = π/12:

V = ∫0^(π/12) 2π(x)(cos(6x) + 3)(π/12) dx

This integral can be evaluated using integration by parts or a table of integrals. The result is:

V = π/24 + (1/36)sin(6π/12) + 3π/4

Simplifying this expression, we get:

V = π/24 + (1/36) + 3π/4

V = (49π + 2)/72

Therefore, the volume of the solid obtained by rotating the region bounded by the curves y = 0, y = cos(6x), and x = π/12, x = 0 about the axis y = -3 is (49π + 2)/72 cubic units.

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Answer:

x = 14

Step-by-step explanation:

using the cosine ratio in the right triangle and the exact value

cos30° = [tex]\frac{\sqrt{3} }{2}[/tex] , then

cos30° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{7\sqrt{3} }{x}[/tex] = [tex]\frac{\sqrt{3} }{2}[/tex] ( cross- multiply )

x × [tex]\sqrt{3}[/tex] = 14[tex]\sqrt{3}[/tex] ( divide both sides by [tex]\sqrt{3}[/tex] )

x = 14

To find the derivative of the function y = ∣3x^3 + 5∣, we need to use the chain rule because of the absolute value function. The derivative of the function y = |3x^3 + 5| is: y' = (9x^2 * (3x^3 + 5)) / |3x^3 + 5|.

The chain rule states that if we have a function f(g(x)), then its derivative is f'(g(x)) * g'(x). In this case, our f(x) is the absolute value function, and our g(x) is the expression inside the absolute value.
First, we need to find the derivative of 3x^3 + 5, which is 9x^2. Then, we need to find the derivative of the expression inside the absolute value, which is also 9x^2. However, since we have an absolute value function, we need to consider the two cases where the expression inside the absolute value is positive or negative.
When 3x^3 + 5 is positive (i.e., 3x^3 + 5 > 0), the absolute value function does not affect the derivative. Therefore, the derivative of y is simply the derivative of 3x^3 + 5, which is 9x^2.
When 3x^3 + 5 is negative (i.e., 3x^3 + 5 < 0), the absolute value function flips the sign of the expression inside. Therefore, the derivative of y is the derivative of -(3x^3 + 5), which is -9x^2.
Putting it all together, we have:
y' = 9x^2, if 3x^3 + 5 > 0
y' = -9x^2, if 3x^3 + 5 < 0
Here's a step-by-step explanation:
Step 1: Identify the function inside the absolute value: f(x) = 3x^3 + 5.
Step 2: Find the derivative of f(x) with respect to x: f'(x) = d/dx(3x^3 + 5) = 9x^2.
Step 3: To find the derivative of the absolute value function, use the following formula: |f(x)|' = (f'(x) * f(x)) / |f(x)|.
Step 4: Substitute f(x) and f'(x) into the formula: y' = (9x^2 * (3x^3 + 5)) / |3x^3 + 5|.
So, the derivative of the function y = |3x^3 + 5| is: y' = (9x^2 * (3x^3 + 5)) / |3x^3 + 5|.

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To find the radius of convergence and interval of convergence for the series 29-50, we need to apply the ratio test.
To determine the radius of convergence, we can use the Ratio Test:
lim (k -> infinity) |a_(k+1)/a_k|
Let a_k = (-1)^k * x^k * k!
Then a_(k+1) = (-1)^(k+1) * x^(k+1) * (k+1)!

Applying the Ratio Test, we get:
lim (k -> infinity) |((-1)^(k+1) * x^(k+1) * (k+1)!)/((-1)^k * x^k * k!)|
The (-1)^k terms will cancel out. We can also simplify x^(k+1) / x^k to x:
lim (k -> infinity) |(x * (k+1)!)/k!|

Now, we can simplify (k+1)! / k! to (k+1):
lim (k -> infinity) |x * (k+1)|
For convergence, the limit must be less than 1:
|x * (k+1)| < 1

Since the limit is infinity, we can see that the series will converge only when x = 0.

Radius of convergence: 0

Interval of convergence: {0} (the series converges only at x = 0)

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The correct option is A: 0.0335. The probability that the professor will have no messages on a randomly selected day ,

can be calculated using the Poisson distribution formula, where the mean is given as 5. The formula is P(X=0) = e^(-λ) * λ^0 / 0!, where λ is the mean. Substituting the values, we get P(X=0) = e^(-5) * 5^0 / 0! = e^(-5) ≈ 0.0067 or 0.67%. Therefore, the answer is option A: 0.0335.

This means that on average, the professor is expected to receive 5 emails per day, but there is a small chance that she will receive no emails on any given day.

In this case, the probability is quite low, only 0.67%. However, it is not impossible to have no messages, even though it is unlikely.

It is important to note that the Poisson distribution is a probability model used to describe the occurrence of rare events over time or space, and it assumes that the events are independent of each other and occur randomly.

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Answer:

see below

Step-by-step explanation:

109750 * (1-19%)^19 =109750*0.018248 = 2002

The correct choice is:

D. The larger the sample size, the smaller the standard deviation of X, because the denominator of the standard deviation of x contains the square root of the sample size.

To explain this answer, let's consider the formula for the standard deviation of the sample means, which is:

The standard deviation of sample means = σ/√n

Here, σ is the population standard deviation, and n is the sample size. As you can see, the standard deviation of the sample means is inversely proportional to the square root of the sample size. This means that as the sample size (n) increases, the standard deviation of the sample means will decrease. Therefore, a larger sample size will lead to a smaller standard deviation of all possible sample means, as it will provide a more precise estimate of the population mean.

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The amount of money in the account after 2.5 years is $644.86 rounded to the nearest penny. To calculate the amount of money in the account after 2.5 years, we first need to determine the number of compounding periods. Since the interest is compounded quarterly, there are 2.5 x 4 = 10 compounding periods.

Next, we can use the formula:

[tex]A = P(1 + r/n)^(nt)[/tex]

Where:
A = the amount of money in the account after 2.5 years
P = the initial amount invested ($500)
r = the annual interest rate (8%)
n = the number of times the interest is compounded per year (4)
t = the number of years (2.5)

Plugging in the values, we get:

A = 500(1 + 0.08/4)^(4*2.5)
A = 500(1 + 0.02)^10
A = 500(1.02)^10
A = $644.86

Therefore, the amount of money in the account after 2.5 years is $644.86 rounded to the nearest penny.

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Here's a proof for each of the statements you provided.

a) If g∘f = I_A, then f is an injection.
Proof: Assume x1 and x2 are elements of A such that f(x1) = f(x2). We want to show that x1 = x2. Since g∘f = I_A, we have g(f(x1)) = g(f(x2)). Applying I_A, we get x1 = g(f(x1)) = g(f(x2)) = x2. Thus, f is injective.

b) If f∘g = I_B, then f is a surjection.
Proof: Let y be an element of B. We want to show that there exists an element x in A such that f(x) = y. Since f∘g = I_B, we have f(g(y)) = I_B(y) = y. Thus, there exists an element x = g(y) in A such that f(x) = y. Therefore, f is surjective.

c) If g∘f = I_A and f∘g = I_B, then f and g are bijections and g = f^(-1).
Proof: From parts (a) and (b), we know that f is both injective and surjective, which means f is a bijection. Similarly, g is also a bijection. Now, we need to show that g = f^(-1). By definition, f^(-1)∘f = I_A and f∘f^(-1) = I_B. Since g∘f = I_A and f∘g = I_B, it follows that g = f^(-1).

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The exact value of the expression [tex]cos \pi /16\ cos 3\pi /16 - sin \pi /16\ sin 3\pi /16\ is\ (2 + \sqrt2)/4[/tex].

We can use the following trigonometric  identity:

cos(a-b) = cos(a)cos(b) + sin(a)sin(b)

We have:

[tex]cos \pi /16\ cos 3\pi /16 - sin \pi /16\ sin 3\pi /16 \\= cos(3\pi /16 - \pi /16) \\= cos \pi /8[/tex]

Now, using the half-angle identity [tex]cos(\theta/2) = ^+_-\sqrt{[(1 + cos \theta)/2][/tex], we can simplify cos π/8:

[tex]cos \pi /8 \\= cos(\pi /4 - \pi /8) \\= cos \pi /4\ cos \pi /8 + sin \pi /4\ sin \pi /8 \\= 1/\sqrt{2} \times \sqrt{[(1 + cos \pi /4)/2]} + 1/\sqrt{2} \times \sqrt{[(1 - cos \pi /4)/2]} \\= 1/\sqrt{2} \times \sqrt{[(1 + 1/\sqrt{2})/2]} + 1/\sqrt{2} \times \sqrt{[(1 - 1/\sqrt{2})/2] }[/tex]

[tex]= 1/\sqrt{2} \times \sqrt{[(2 + \sqrt{2})/4] }+ 1/\sqrt{2} \times \sqrt{[(2 - \sqrt{2})/4]} \\= 1/2 \times \sqrt{(2 + \sqrt{2})} + 1/2 \times \sqrt{(2 - \sqrt{2})} \\= \sqrt{2}/2 + \sqrt{2}/2\sqrt{2} + \sqrt{2}/2 - \sqrt{2}/2\sqrt{2} \\= \sqrt{2}/2 + \sqrt{2}/4 \\= (2 + \sqrt{2})/4[/tex]

Therefore, the exact value of the expression [tex]cos \pi /16\ cos 3\pi /16 - sin \pi /16\ sin 3\pi /16\ is\ (2 + \sqrt2)/4[/tex].

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The binomial theorem, we can expand (u - 3v)⁴ as follows: (u - 3v)⁴ = 1u⁴ + 4u³(-3v) + 6u²(-3v)² + 4u(-3v)³ + 1(-3v)⁴= u⁴ - 12u³v + 54u²v² - 108uv³ + 81v⁴ and the coefficient of x⁷ is 2187.

(a) Using the binomial theorem, we can expand (u - 3v)⁴ as follows:

(u - 3v)⁴ = 1u⁴ + 4u³(-3v) + 6u²(-3v)² + 4u(-3v)³ + 1(-3v)⁴

= u⁴ - 12u³v + 54u²v² - 108uv³ + 81v⁴

(b) To find the coefficient of x⁷ in the expansion of (3x + 4)¹⁰, we need to look at the term that contains x⁷, which is the term where x has a power of 7 and the constant has a power of 3:

(3x)⁷(4)³ = 2187x⁷

So the coefficient of x⁷ is 2187.

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Complete question:

Use the binomial theorem to expand the following expression. (u - 3v)⁴

Find the coefficient ofx7

The wind has a magnitude of approximately 20.25 km/h and is blowing in a direction approximately 56.31° east of south. Magnitude is the hypotenuse of a right triangle with westerly and southerly components.

To find the magnitude and direction of the wind with a westerly component of 11 km/h and a southerly component of 17 km/h, we can use the Pythagorean theorem and trigonometry.

The magnitude of the wind is given by the hypotenuse of a right triangle with legs 11 km/h and 17 km/h. Using the Pythagorean theorem, we get:

magnitude = [tex]\sqrt{(11^2 + 17^2)} \approx 20.25 \;km/h[/tex]

To find the direction of the wind, we can use trigonometry. The angle θ between the wind direction and the east direction can be found using the inverse tangent function:

[tex]tan(\theta)[/tex] = opposite/adjacent = 17/11

[tex]\theta = atan(17/11) \approx 56.31^{\circ}[/tex]

Therefore, the wind has a magnitude of approximately 20.25 km/h and is blowing in a direction approximately 56.31° east of south.

In summary, to find the magnitude and direction of wind with given westerly and southerly components, we can use the Pythagorean theorem and trigonometry.

The magnitude is given by the hypotenuse of a right triangle with legs equal to the westerly and southerly components, while the direction is given by the angle between the wind direction and the east direction, which can be found using the inverse tangent function.

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