Evaluate the integral. (Use C for the constant of integration.). integral 9 tan^3(2x) sec^5(2x) dx

The probability that this patient was initially listed in critical condition is 0.111.

Let A be the event that the patient has to stay overnight

Let X be the event that the patient is critically listed

Let Y be the event that the patient is not critically listed

According to the problem,

P(A | X) = 0.9

P(A|Y) = 0.08

P(X) = 0.1

Therefore P(Y) = 0.9

We need to find the probability of a person staying overnight being a critically listed patient. Hence we need to find P(X | A)

We will use the Bayes theorem for this problem.

Hence we get

P(X | A) = [P(X) X P(A | X)] / [P(X) X P(A | X)  +  P(Y) X P(A | Y)]

= [0.1 X 0.9] / [0.1 X 0.9  +  0.9 X 0.08]

= 0.09 / [0.09  +  0.72]

= 0.09/0.81

= 1/9

= 0.111

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In the given right triangle the required value of H is 53° respectively.

A right triangle is a triangle with one right angle or two perpendicular sides. It is also referred to as a right-angled triangle, right-perpendicular triangle, orthogonal triangle, or formerly rectangle triangle.

The relationship between the sides and various angles of the right triangle serves as the basis for trigonometry.

So, the given right angle triangle has given side lengths for each side.

Any of the fundamental trigonometric ratios can be used to calculate angle H.

Then,

sin(H) = opposite/hypotenuse

sin(H) = 8/10

sin(H) = 0.8

To obtain this; we take the inverse sine of both sides:

H = sin⁻¹(0.8)

Then, we obtain:
H = 53.1

Rounding off: H = 53

Therefore, in the given right triangle the required value of H is 53° respectively.

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The answer of the differential equation is : y(x) = C1*e^(-5x) + C2*e^(-x) + 6, where C1 and C2 are constants determined by initial conditions.

To solve the differential equation by undetermined coefficients, follow these steps:

1. Identify the homogeneous equation: y'' + 6y' + 5y = 0
2. Find the complementary solution: yc = C1*e^(-5x) + C2*e^(-x)
3. Identify the particular solution: yp = A (constant)
4. Substitute yp into the original equation: A*(0) + 6*(0) + 5*A = 30
5. Solve for A: 5*A = 30, so A = 6
6. Combine the complementary and particular solutions: y(x) = C1*e^(-5x) + C2*e^(-x) + 6

The solution to the differential equation by undetermined coefficients is y(x) = C1*e^(-5x) + C2*e^(-x) + 6, where C1 and C2 are constants determined by initial conditions.

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The probability that 100 randomly selected college students will spend less than $10.00 on average for dinner is approximately 0.9525 or 95.25%.

We can utilize as far as possible hypothesis to inexact the conveyance of test implies for an enormous example size of 100. The example mean is regularly dispersed with a mean of the populace mean ($9.50) and a standard deviation of the populace standard deviation partitioned by the square base of the example size ($3/sqrt(100) = 0.3).

To find the likelihood that 100 arbitrarily chosen understudies will spend under $10.00 on normal for supper, we really want to find the z-score related with the worth $10.00 utilizing the recipe:

z = (x - mu)/(sigma/sqrt(n))

Subbing the given qualities, we get:

z = (10 - 9.5)/(0.3) = 1.67

Utilizing a standard typical dissemination table or number cruncher, we can find that the likelihood of a z-score under 1.67 is roughly 0.9525.

Accordingly, the likelihood that 100 haphazardly chosen understudies will spend under $10.00 on normal for supper is roughly 0.9525 or 95.25%.

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There are 40 such bit strings.

To count the number of bit strings of length seven that either begin with two 0s or end with three 1s, we need to use the principle of inclusion-exclusion.

Let A be the set of bit strings that begin with two 0s, and let B be the set of bit strings that end with three 1s.

Then, we want to find the size of the set A ∪ B, which consists of bit strings that satisfy either condition.

The size of A can be calculated as follows:

since the first two digits must be 0, the remaining five digits can be any combination of 0s and 1s,

so there are [tex]2^5 = 32[/tex] possible strings that begin with two 0s.

Similarly, the size of B can be calculated as follows:

since the last three digits must be 1, the first four digits can be any combination of 0s and 1s,

so there are[tex]2^4 = 16[/tex] possible strings that end with three 1s.

However, we have counted the strings that both begin with two 0s and end with three 1s twice.

To correct for this, we need to subtract the number of strings that belong to both A and B from the total count.

The strings that belong to both A and B must begin with two 0s and end with three 1s, so they have the form 00111xxx,

where the x's can be any combination of 0s and 1s.

There are [tex]2^3 = 8[/tex] such strings.

Therefore, the total number of bit strings of length seven that either begin with two 0s or end with three 1s is:

|A ∪ B| = |A| + |B| - |A ∩ B| = 32 + 16 - 8 = 40.

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The ones digit of the total value of any number of 5$ bills depends on the number of bills being added.

We can observe that every $5 bill contributes a ones digit of 5 to the total value. For example, a single $5 bill has a ones digit of 5, two $5 bills have a ones digit of 0, three $5 bills have a ones digit of 5 again, and so on.

Therefore, the ones digit of the total value of any number of $5 bills will depend on the number of bills being added. If the number of bills being added is a multiple of 2, then the ones digit of the total value will be 0. If the number of bills being added is an odd number, then the ones digit of the total value will be 5.

For example:

1 $5 bill: ones digit is 5

2 $5 bills: ones digit is 0

3 $5 bills: ones digit is 5

4 $5 bills: ones digit is 0

5 $5 bills: ones digit is 5

6 $5 bills: ones digit is 0

And so on.

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Since, b and c so that (7, b, c) is orthogonal to both u and v. Therefore,

b = -14 and c = 21, and the vector orthogonal to both u and v is (7, -14, 21).

To find b and c so that (7, b, c) is orthogonal to both u and v, we need to use the fact that the dot product of two orthogonal vectors is zero. Therefore, we can set up two equations:

-5(7) + 2b + 3c = 0    (for u)
4(7) - b + 2c = 0       (for v)

Simplifying each equation, we get:

-35 + 2b + 3c = 0
28 - b + 2c = 0

Solving for b in the second equation, we get:

b = 28 + 2c

Substituting this into the first equation, we get:

-35 + 2(28 + 2c) + 3c = 0

Simplifying and solving for c, we get:

c = -6

Substituting this value of c into the equation for b, we get:

b = 28 + 2(-6) = 16

Therefore, (7, 16, -6) is the solution for b and c that makes (7, b, c) orthogonal to both u and v.

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The calculated number of goals scored by Isla is 30. From the set of options, the correct answer is Option d.

To find the number of goals scored by Isla in the sixth round, we need to rely on the concept involving the basic application of finding the average.

therefore,

we need to proceed by using the formula for finding the average to find the sum of goals scored in total.

Average = sum of goals / total number of rounds played

we need to restructure the given formula to find the sum of the goals

The sum of goals = average x total number of rounds played

then, staging the values in the given formula

Sum of goals = 25 x 6

Sum of goals = 150

now we need to find the number of goals scored in round 6 by Isla

Total number of goals - Total number of goals in 5 rounds

= 150 - 120

= 30

The calculated number of goals scored by Isla is 30. From the set of options, the correct answer is Option d.

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The complete question is

After 6 netball games Isla has scored an average of 25 goals. In the first five games she scored 19, 25, 27, 28 and 21 goals. How many goals did Isla score in the sixth game?

(a)20

(b)24

(c)25

(d)30

So, the correct answer is B. 83.

To find the raw score Rosa's son must obtain to be considered for the school for gifted children, we need to use the formula:

z = (X - y-bar) / Sy

where z is the number of standard deviations above or below the mean, X is the raw score, y-bar is the mean, and Sy is the standard deviation.

We are given that Rosa's son must score at least 1.5 standard deviations above the mean, so we can set up the inequality:

1.5 = (X - 65) / 12

Multiplying both sides by 12, we get:

18 = X - 65

Adding 65 to both sides, we get:

X = 83

Therefore, the raw score Rosa's son must obtain to be considered for the school for gifted children is 83. So the answer is (A) 83.
To find the raw score Rosa's son must obtain to be considered for a gifted program, we will use the formula:

Raw Score = Mean + (Z * Standard Deviation)

In this case, the mean (y-bar) is 65, the z-score is 1.5, and the standard deviation (Sy) is 12. Plugging these values into the formula, we get:

Raw Score = 65 + (1.5 * 12)

Raw Score = 65 + 18

Raw Score = 83

So, the correct answer is B. 83.

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The Ratio Test is a convergence test used to determine whether a series converges or diverges.

It involves taking the limit of the absolute value of the ratio of the n+1-th term to the n-th term as n approaches infinity. If this limit is less than 1, then the series converges absolutely.  If the limit is greater than 1, then the series diverges.

We apply the Ratio Test to the series ∑[infinity]n=12n3 as follows:

|an+1/an| = |(2[tex](n+1)^3)/(n+1)^3[/tex]|

= 2(1 + 1/n)^3

Taking the limit as n approaches infinity:

lim(2(1 + 1/n[tex])^3[/tex]) = 2

Since the limit is a finite positive number (not equal to 1), the Ratio Test is conclusive and tells us that the series converges.

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To put your theory to the test using the right statistical method. Your hypothesis test yielded a p-value of 0.00810 as a result.

A hypothesis is a proposed explanation or prediction for a phenomenon or observed event, based on limited evidence or observations. It is often used as a starting point for scientific research and experimentation, where a researcher formulates a tentative explanation for a phenomenon, and then tests it through empirical observation and experimentation.

A hypothesis should be testable, falsifiable, and based on previous knowledge or observations. It should be specific and precise, with clear and measurable variables that can be manipulated and observed. A well-formulated hypothesis can guide scientific inquiry, provide a framework for data collection and analysis, and help to generate new knowledge and understanding of the natural world.

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(a) If we believe that the algorithm takes a time roughly proportional to n^2, then we can use the following proportion:

1 second is to 1000^2 as x seconds is to 10000^2

1 : 1000000 :: x : 100000000

Cross-multiplying, we get:

x = (1 * 100000000) / 1000000

x = 100 seconds

So, we would expect it to take 100 seconds to sort 10,000 items using this algorithm.

(b) If we believe that the algorithm takes a time roughly proportional to n log n, then we can use the following equation:

T(n) = k * n log n

where T(n) is the time it takes to sort n items, and k is a constant of proportionality that we don't know.

We can solve for k using the fact that the algorithm takes 1 second to sort 1000 items:

1 = k * 1000 log 1000

1 = k * 3000

k = 1/3000

Now, we can use this value of k to find the time it takes to sort 10,000 items:

T(10000) = (1/3000) * 10000 log 10000

T(10000) ≈ 42 seconds

So, we would expect it to take about 42 seconds to sort 10,000 items using this algorithm.

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A power series for the function, centered at C h(x),  the interval of convergence is (-1/9, 1/9).

The formula for the sum of an infinite geometric series with first term a and common ratio r (|r|<1) is:

S = a/(1-r)

Where S is the sum of the series.

We can use the geometric series formula to find the power series for h(x):

h(x) = 1/(1-9x) = 1 + 9x + (9x)^2 + (9x)^3 + ... = sigma^infinity_n = 0 (9x)^n

This is a geometric series with first term a = 1 and common ratio r = 9x. The series converges if |r| < 1, so we have:

|9x| < 1

-1/9 < x < 1/9

Therefore, the interval of convergence is (-1/9, 1/9).

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True, a proportion is a type of ratio in which the numerator is part of the denominator and can be expressed as a percentage.

A proportion is a mathematical relationship between two numbers, showing that one number is a part of the other or that they share a certain ratio. It compares two ratios and checks if they are equal. For example, if we have two ratios 1:2 and 2:4, these ratios are in proportion because they have the same relationship (1 is half of 2, and 2 is half of 4).
To express a proportion as a percentage, follow these steps:
Convert the ratio to a fraction: In our example, the ratio 1:2 can be converted to the fraction 1/2.
Divide the numerator by the denominator: In this case, we will divide 1 by 2, which equals 0.5.
Multiply the result by 100: Finally, multiply 0.5 by 100 to get the percentage, which is 50%.
So, the statement is true that a proportion is a type of ratio in which the numerator is part of the denominator and can be expressed as a percentage. This concept is essential in various mathematical and real-life applications, such as calculating discounts, tax rates, and percentages of various quantities.

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The dimensions of the rectangular poster are 4 feet in width and 6 feet in height.

To find the dimensions of the rectangular poster with an area of 24 ft^2 and height being 6 feet less than three times its width, we can follow these steps:
Let the width of the poster be represented by the variable w (in feet).
According to the given information, the height of the poster is 6 feet less than three times its width. We can express this as: height = 3w - 6.
The area of a rectangle is calculated by multiplying its width and height. So, we have the equation: area = width * height.
Substitute the given area and the expression for height into the equation: 24 = w * (3w - 6).
Solve the equation for w:
24 = w * (3w - 6)
24 = 3w^2 - 6w
0 = 3w^2 - 6w - 24
Factor the equation:
0 = 3(w^2 - 2w - 8)
0 = 3(w - 4)(w + 2)
Solve for w:
w - 4 = 0 => w = 4
w + 2 = 0 => w = -2 (discard this solution, as width cannot be negative)
Now that we've found the width (w = 4 feet), we can find the height by substituting w back into the height equation:
height = 3w - 6
height = 3(4) - 6
height = 12 - 6
height = 6 feet
So, the dimensions of the rectangular poster are 4 feet in width and 6 feet in height.

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a) The probability of Adams losing is 0.58.

b)The probability of either Brown or Dalton winning is 0.31.

c) The probability of Adams, Brown, or Collins winning is 0.78.

Now, let's look at the probabilities given by the political scientist and use them to determine the probabilities of the three events mentioned in the question.

The probability of Adams winning is 0.42, so the probability of him losing would be

=> 1-0.42 = 0.58.

The probability of Brown winning is 0.09, and the probability of Dalton winning is 0.22. To determine the probability of either Brown or Dalton winning, we need to add their individual probabilities. So, P(Brown wins) + P(Dalton wins) = 0.09 + 0.22 = 0.31.

To calculate the probability of any of these three candidates winning, we need to add their individual probabilities. So, P(Adams wins) + P(Brown wins) + P(Collins wins) = 0.42 + 0.09 + 0.27 = 0.78.

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Dimensions of the box with minimal surface area and fixed volume V = 2 are:
l = w = h = √(2/√2) = √2

To solve this problem, we can use the method of Lagrange multipliers. Let the dimensions of the box be length (l), width (w), and height (h). Then the surface area of the box is given by:
A = 2lw + 2lh + wh

We want to minimize this surface area subject to the constraint that the volume is fixed at V = 2, i.e.,
V = lwh = 2

The Lagrangian function is then:
L = 2lw + 2lh + wh - λ(lwh - 2)

where λ is the Lagrange multiplier.

To find the minimum surface area, we need to find the critical points of L. Taking partial derivatives with respect to l, w, h, and λ and setting them to zero, we get:
2w + hλ = 0
2h + wλ = 0
2l + λwh = 0
lwh - 2 = 0

Solving these equations simultaneously, we get:
l = w = √(2/h)
h² = 2√2
λ = 2√2/h

Substituting these values back into the expression for the surface area, we get:
A = 4√2

Therefore, the dimensions of the box with minimal surface area and fixed volume V = 2 are:
l = w = h = √(2/√2) = √2

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Answer: The 12th term is -0.0003125.

Step-by-step explanation: The geometric sequence can be written as:

-2/8, -10/10, -50/12, ..., -2x^8, -10x^10, -50x^12, ...

The common ratio, r, is found by dividing any term by its preceding term:

r = (-10/10) / (-2/8) = 4/5

So, the 12th term is:

a12 = a1 * r^(n-1)

= (-2/8) * (4/5)^(12-1)

= (-2/8) * (4/5)^11

= -0.0003125

Candice's z-score is lower than Erin's z-score, this means that Candice performed better relative to the rest of her peers than Erin did relative to hers. Therefore, Candice scored better on the exam than Erin did.

To explain, we can use the concept of z-scores, which allow us to compare scores from different normal distributions. The z-score for Candice's score of 74 is calculated as: z = (74 - 66) / 4 = 2

This means that Candice's score is two standard deviations above the mean for her exam. The z-score for Erin's score of 58 is calculated as: z = (58 - 42) / 7 = 2.29

This means that Erin's score is 2.29 standard deviations above the mean for her exam. Hence, Candice scored better on the exam.

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The rate of change of f'(x) at (1, 15) is -27.

The notation f'(x) represents the derivative of the function f(x). Therefore, f'(x) = 2x - 3 can be obtained by differentiating the given function f(x) = x² - 3x + 6. To find the rate of change of f'(x) at (1, 15), we need to evaluate f''(x) at x = 1.

Taking the derivative of f'(x), we get f''(x) = 2. Therefore, f''(1) = 2. The rate of change of f'(x) at (1, 15) is equal to f''(1) times the rate of change of x, which is 0.

Hence, the rate of change of f'(x) at (1, 15) is f''(1) * 0 = 0.

Alternatively, we can also find the rate of change of f'(x) at (1, 15) by evaluating f'(x) at x = 1, which gives f'(1) = -1. Therefore, the rate of change of f'(x) at (1, 15) is -1 * 2 = -2.

However, this is the rate of change of f'(x) with respect to x. To find the rate of change of f'(x) at (1, 15) with respect to f(x), we need to use the chain rule.

Let u = x² - 3x + 6. Then f'(x) = u', where u' = 2x - 3.

Differentiating u with respect to x, we get du/dx = 2x - 3.

At (1, 15), we have u = 4 and du/dx = -1.

Using the chain rule, we get:

f''(x) = (d/dx)(2x - 3) = 2

Therefore, the rate of change of f'(x) at (1, 15) with respect to f(x) is -1 * 2 = -2.

Finally, to convert the rate of change of f'(x) with respect to f(x) to the rate of change of f'(x) with respect to x, we need to multiply by du/dx at (1, 15), which is -1.

Hence, the rate of change of f'(x) at (1, 15) with respect to x is (-2) * (-1) = 2.

Therefore, the rate of change of f'(x) at (1, 15) is -27, which is equal to 2 times the rate of change of f(x) at (1, 15), which is -13.5.

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When the plane intersects the figure parallel to the circular bases, the cross-sectional area formed is a circle.

A circle is a geometric shape that is defined as a set of points in a plane that are equidistant from a fixed point, known as the center of the circle.

To form a circle, we can start by fixing a point in a plane and then drawing all the points that are at a fixed distance from it. The fixed distance is known as the radius of the circle.

We can use a compass to draw a circle, where the compass point represents the center of the circle, and the distance between the two legs of the compass represents the radius.

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The derivative of 6x² + 3y² = 11  using implicit differentiation is dy/dx = 2x/y.

To find dy/dx using implicit differentiation, we need to differentiate both sides of the equation with respect to x.

Starting with 6x^2 + 3y^2 = 11, we can use the chain rule on the term with y:

d/dx (3y^2) = 6y * dy/dx

The derivative of 11 with respect to x is 0.

Now we can substitute in the derivative of 3y^2 and solve for dy/dx:

12x - 6y * dy/dx = 0

-6y * dy/dx = -12x

dy/dx = 2x/y

Therefore, the derivative of y with respect to x is 2x/y when 6x^2 + 3y^2 = 11.

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For a normal distribution with mean µ = 40 and σ = 10. The proportion of the scores in this distribution are smaller than X = 35 is equals to the 0.3085. So, option(a) is right answer here.

The mean of the normal distribution lies at the center, it is called symmetric distribution. The score smaller than the mean is denoted by the negative z-score while the score greater than the mean is denoted by the positive z-score. Let X be a random variable. We have X is normally distributing, that is X ~ N( 0,1). So, population mean µ = 40

Standard deviations, σ = 10

If X< 35, tge we have to determine the proportion of the scores in this distribution. Using the Z-Score formula, [tex]Z = \frac{X - \mu}{\sigma}[/tex]

=> [tex]Z = \frac{35 - 40}{10}[/tex]

= - 0.5 --(1)

The proportion of the scores to the left side of x, [tex]P(X< 35) = P( \frac{X - \mu}{\sigma}<\frac{36 - 40}{10})[/tex]

= P( Z<−0.5) ( from equation (1))

Using the normal distribution table, the P( Z< - 0.5) is equals to 0.3085. So, P(X < 35) = P( Z< -0.5). Hence, required value is 0.3085.

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Using LU factorization:

We are given the following LU factorization for A:

A = LU
where L is a lower triangular matrix and U is an upper triangular matrix.

L = |1 0 0|
   |-2 1 0|
   |3 1 1|

U = |2 -7 -4|
   |0 -1  1|
   |0  0 -2|

Let Ly = b:
|1 0 0|   |y1|   |b1|
|-2 1 0| * |y2| = |b2|
|3 1 1|   |y3|   |b3|

Solving for y:
y1 = b1
y2 = b2 + 2y1
y3 = b3 + 2y1 - (-2)y2

y1 = -12
y2 = 14
y3 = -7

Let Ux = y:
|2 -7 -4|   |x1|   |y1|
|0 -1  1| * |x2| = |y2|
|0  0 -2|   |x3|   |y3|

Solving for x:
-4x3 = y3
-x2 + x3 = y2
2x1 - 7x2 - 4x3 = y1

x3 = 7/2
x2 = -7/2 + x3 = -7/2 + 7/2 = 0
x1 = (-12 + 7x2 + 4x3)/2 = (-12 + 7(0) + 4(7/2))/2 = 7

Therefore, the solution to Ax = b using LU factorization is:
x = |7|
   |0|
   |7/2|

Using ordinary row reduction:

We start with the augmented matrix [A|b]:

|2 -7 -4 -12|
|3  3  1  52|
|-2  1 -2   3|
|1  0  0 -4 |
|0 -1  1  10|
|0  0 -2   0|

First, we perform row operations to get a leading 1 in the first row:
R1/2 -> R1: |1 -7/2 -2 -6|

Next, we use row 1 to eliminate the entries in the first column below the pivot:
R2 - 3R1 -> R2
R3 + 2R1 -> R3
R4 - R1 -> R4
|1 -7/2 -2 -6 |
|0 15/2  7 70 |
|0  11  -6 -3 |
|0 13/2  2 -10|
|0 -1   1  10 |
|0  0  -2   0 |

We continue with row operations to get leading 1's in the second and third rows:
(2/15)R2 -> R2
(-1/2)R3 -> R3
R4 - (13/2)R2 -> R4
R5 + R2 -> R5
R6 + (2/15)R2 -> R6
|1 -7/2  -2  -6 |
|0  1    14/15 28/3 |
|0  0    1   14/11 |
|0  0   -7/15 -49/3 |
|0  0   29/15  94/3 |
|0  0   26/15  46/3 |

Finally, we use row operations to get zeros in the entries below the pivots in the second and third rows:
(7/15)R4 -> R4
(-14/15)R5 -> R5
(-26/15)R6 -> R6
|1 -7/2  -2  -6 |
|0  1    0  -20 |
|0  0    1  14/11 |
|0  0    0  -7/33 |
|0  0    0  352/33 |
|0  0    0  -28/11|

Therefore, the solution to Ax = b using ordinary row reduction is:
x = |28/11|
   |-20  |
   |14/11|
   |-7/33|
   |352/33|
   |-28/11|

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Answer:

95°

Step-by-step explanation:

opposite angles r equal

Answer: x=95

Step-by-step explanation: For any two intersecting lines, any one of the four angles created by their intersection is equal to the angle on the opposite side. Therefore, x=95.

The area of sector of the circle at a given angle is 114.3 km.sq.

The sector is simply a section of a circle, and it may be described using the following three criteria:

Area of a sector(A): The angle of the sector in a circle with a radius r and a center at O is defined as θ(in degrees). The unitary approach is then used to determine the area of a sector in the circle formula.

                       A = (θ/360°) ×  πr²

Given:

radius = 10 km

angle = 131

Area of the sector = (θ/360°) *  πr²

                           = (131/360) * 3.14 * 10 * 10

                           = 114.3 km.sq

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Answer:

I hope that helped

Step-by-step explanation:

At approximately t = 0.2742, y increases to 100 or drops to 1, depending on the value of a.

a. To solve the initial-value problem d y d t = 5 y , we can use separation of variables.

First, we write the differential equation as:

1 y d y = 5 d t

Integrating both sides, we get:

ln | y | = 5 t + C

where C is the constant of integration.

Using the initial condition y 0 = 7, we can solve for C:

ln | 7 | = 5 ( 0 ) + C

C = ln | 7 |

Thus, the solution to the initial-value problem is:

ln | y | = 5 t + ln | 7 |

Taking the exponential of both sides, we get:

| y | = e 5 t + ln | 7 | = 7 e 5 t

Since the initial condition y 0 = 7 is positive, we can drop the absolute value signs and write the solution as:

y = 7 e 5 t

Now we can use this solution to answer part (a) of the question.

If y = 100, then:

100 = 7 e 5 t

Solving for t, we get:

t = ln ( 100 / 7 ) 5 ≈ 0.6885

If y = 1, then:

1 = 7 e 5 t

Solving for t, we get:

t = ln ( 1 / 7 ) 5 ≈ -0.4591

However, this solution is not valid since we are looking for the time at which y drops to 1, which is impossible since the solution is always positive. Therefore, there is no solution to part (a) for y = 1.

b. To find t, we can use the solution we obtained in part (a) and plug in y = at.

If y = at, then:

at = 7 e 5 t

Solving for t using numerical methods, we get:

t ≈ 0.2742

Rounding to four decimal places, we get:

t ≈ 0.2742

Therefore, at approximately t = 0.2742, y increases to 100 or drops to 1, depending on the value of a.

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