why did school districts prefer hiring unmarried women as teachers in the late nineteenth and early part of the twentieth century?

For the term 1/(s²+4)(s²+1), the partial fraction decomposition would be A/(s²+4) + B/(s²+1), where A and B are constants that can be solved using algebraic equations.

The Laplace transform of e^(-2πs)sin(t-2π) is (s/(s²+1)² + 4π/(s²+1)). For the term (3s+6)/(s²+4), you can separate it into 3s/(s²+4) and 6/(s²+4), and their Laplace transforms would be (3/2)cos(2t) and (3/2)sin(2t), respectively. Once you have the Laplace transforms for each term, you can use linearity of Laplace transforms to get the solution of the given initial value problem.

Laplace transforms are a mathematical tool used to transform a function of time into a function of complex frequency. This transformation allows for the solving of differential equations, particularly those with initial conditions, by converting them into algebraic equations that can be easily solved.

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Option A. There were about 204 principals in attendance is correct answer.

A ratio that compares a part to the whole is a percentage. When describing the relative frequency of a particular outcome in a population or sample, it is frequently employed in statistics. For instance, if a sample of 100 persons includes 30 women, we can say that the percentage of women in the sample is 30%, or 0.3. Based on the sample data, proportions can be used to forecast and infer things about the population. For instance, if we choose a person at random from the population, the percentage of women in the population is probably quite similar to the percentage of women in the sample. Moreover, proportions can be utilised to contrast various groups.

For the given situation using proportion we have:

Proportion of principals = 14/60 = 0.2333.

Now, principals in conference are:

875 x 0.2333 = 204.13 = 204

Hence, Option A. There were about 204 principals in attendance is correct answer.

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Option A. There were about 204 principals in attendance is correct answer.

A ratio that compares a part to the whole is a percentage. When describing the relative frequency of a particular outcome in a population or sample, it is frequently employed in statistics. For instance, if a sample of 100 persons includes 30 women, we can say that the percentage of women in the sample is 30%, or 0.3. Based on the sample data, proportions can be used to forecast and infer things about the population. For instance, if we choose a person at random from the population, the percentage of women in the population is probably quite similar to the percentage of women in the sample. Moreover, proportions can be utilised to contrast various groups.

For the given situation using proportion we have:

Proportion of principals = 14/60 = 0.2333.

Now, principals in conference are:

875 x 0.2333 = 204.13 = 204

Hence, Option A. There were about 204 principals in attendance is correct answer.

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After calculating the surface area of cylindrical box  of height 8 inches and radius 9 inches we came to know we need approximately 960.84 square inches of wrapping paper to cover the top, bottom, and all the way around the cylindrical box.

Surface area is the total area that the surface of an object occupies. It includes all the faces, sides, and tops of the object. It is measured in square units and is used to calculate the amount of material needed to cover the object.

Radius is the distance from the center of a circle to any point on its circumference, which is half the diameter.

Height refers to the measurement of how tall an object or person is from its base to its highest point.

According to the given information :

To find the amount of wrapping paper needed to wrap a cylindrical box with a height of 8 inches and radius of 9 inches, we will use the formula for the surface area of a cylinder:

A = 2πr² + 2πrh

Where A is the surface area, r is the radius of the circular base of the cylinder, and h is the height of the cylinder.

Plugging in the given values, we get:

A = 2π(9)² + 2π(9)(8)

A = 2π(81) + 2π(72)

A = 162π + 144π

A = 306π

Therefore, the surface area of the cylindrical box is 306π square inches. If we use the approximation of π as 3.14, we get:

A ≈ 306(3.14)

A ≈ 960.84

So, we need approximately 960.84 square inches of wrapping paper to cover the top, bottom, and all the way around the cylindrical box.

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By answering the presented question, we may conclude that As a result, exponential growth after 9 years, we may expect  [tex]768[/tex] banana plants to be infected.

The exponential function formula is f(x)=abx, where a and b are positive real values. Draw exponential functions for various values of a and b using the tools provided below.

We may use the exponential growth formula to address this problem:

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

where A denotes the total number of infected banana plants after t years

P denotes the initial number of infected banana plants.

r denotes the yearly growth rate in decimal form.

t denotes the number of years

In this instance, we have:

[tex]P = 476 \sr = 0.05 \st = 9[/tex]

When we enter these values, we get:

[tex]A = 476(1 + 0.05)^9 \sA \approx 768.44[/tex]

When we round this up to the next full number, we get:

[tex]A \approx 768[/tex]

Therefore, after 9 years, we may expect 768 banana plants to be infected.

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Hi! The probability that Chris will win the election is 5/8 or 0.625, and the probability that Chris does not win is 3/8 or 0.375. It has been mentioned that the odds in favor of Chris winning the election are 5:3.

a) To find the probability that Chris wins, we can use the formula:
Probability = (Odds in favor) / (Odds in favor + Odds against)
In this case, the odds in favor are 5, and the odds against are 3. So, the probability of Chris winning is:
Probability = 5 / (5 + 3)
Probability = 5 / 8
The probability that Chris wins the election is 5/8 or 0.625.

b) To find the probability that Chris does not win, we can simply subtract the probability of Chris winning from 1:
Probability (Chris does not win) = 1 - Probability (Chris wins)
Probability (Chris does not win) = 1 - 5/8
Probability (Chris does not win) = 3/8 or 0.375

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Hi! The probability that Chris will win the election is 5/8 or 0.625, and the probability that Chris does not win is 3/8 or 0.375. It has been mentioned that the odds in favor of Chris winning the election are 5:3.

a) To find the probability that Chris wins, we can use the formula:
Probability = (Odds in favor) / (Odds in favor + Odds against)
In this case, the odds in favor are 5, and the odds against are 3. So, the probability of Chris winning is:
Probability = 5 / (5 + 3)
Probability = 5 / 8
The probability that Chris wins the election is 5/8 or 0.625.

b) To find the probability that Chris does not win, we can simply subtract the probability of Chris winning from 1:
Probability (Chris does not win) = 1 - Probability (Chris wins)
Probability (Chris does not win) = 1 - 5/8
Probability (Chris does not win) = 3/8 or 0.375

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The open interval where the function is increasing at  (-∞, ∞), decreasing at 0, or constant at 3.

Here we have the graph and through the graph we have to find the open interval(s) where the following function is increasing, decreasing, or constant.

While we looking into the give  graph we have identified that the function of the graph is determined as.

=> y = 3x + 2

To determine whether the function y = 3x + 2 is increasing, decreasing, or constant, we can analyze its first derivative.

The first derivative of y = 3x + 2 is y' = 3.

As the first derivative is a constant (y' = 3), the original function is continuously increasing for all values of x, and there are no intervals in which it is decreasing or constant.

Thus, the open interval where y = 3x + 2 is increasing is (-∞, ∞).

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The 99.9% confidence interval for the mean mathematics SAT score is 462 ± 38, which is approximately 424 < u < 50O and If the sample size were 155 rather than 175, the margin of error would be larger.

Explanation: -

(a) To construct a 99.9% confidence interval for the mean mathematics SAT score, we'll use the given information, where the current interval is 424 < u < 500.

First, we need to find the margin of error (ME) in the current interval:

ME = (Upper limit - Lower limit) / 2
ME = (500 - 424) / 2
ME = 76 / 2
ME = 38

Now, we'll use the formula for the confidence interval:

Confidence interval = sample mean ± (ME)

Given that the sample size is 175, we'll calculate the sample mean:

Sample mean = (Lower limit + Upper limit) / 2
Sample mean = (424 + 500) / 2
Sample mean = 924 / 2
Sample mean = 462

So, the 99.9% confidence interval for the mean mathematics SAT score is 462 ± 38, which is approximately 424 < u < 500, as given.

If the sample size were 155 rather than 175, the margin of error would be larger. The reason for this is that the margin of error is inversely proportional to the square root of the sample size. As the sample size decreases, the margin of error increases, making the confidence interval wider. In other words, a smaller sample size provides less information and less certainty about the population mean, so the interval needs to be wider to maintain the same level of confidence (99.9% in this case).

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The required length of the missing side in the triangle is x = 5 in.

A right-angle triangle is shown in the figure, we have to determine the unknown measure x in the triangle.

Applying the Pythagoras theorem,
12² + x² = 13²
144 + x² = 169
x² = 169-144
x² = 25
x = √25
x = ± 5

Since x = 5, the length can never be negative.

Thus, the requried measure of x in the given triangle is 5.

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The amount of fencing, dirt and sod for the baseball field are: length of Fencing & 1410.5 ft. Area of the sod ≈ 118017.13ft² Area of the field covered with distance ≈ 7049.6ft²

Area of a circle = πr²

Circumference of a circle = 2πr

where r is the radius of the circle

The area of a Quarter of a circle is therefore;

Area of a circle/ 4

The perimeter of a Quarter of a Circle is;

The perimeter of a circle/4

Fencing = ¼ x 2 x π x 380 + 2 x 15 +2 x 380 + ¼ x 2 x π x 15

Fencing = 197.5π + 190π = 1410.5 feet.

Grass =

π/4 x (380 - 6)² + 87 ² - π/4 × (87 + 30)² + 2 x 380 x 15 + π/4 x 15² - (3/4) x π x 10² - 25π

= 31528π + 18969 = 118017.13

The area Covered by the sod is about 118017.13Sq ft.

Dirt = π/4 x 380 ² - π/4 x (380 - 6)² + π/4 (87 + 30)² - 87² + π100 = (18613π - 30276)/4

= 7049.6

Therefore, the area occupied by the dirt is about 7049.6 Sq ft.

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The calculated value of x in the triangle is 4.79 feet

From the question, we have the following parameters that can be used in our computation:

X

7 feet

43.2°

The value of x in the triangle can be calcuated using the following sine rule

sin(43.2) = x/7

Make x the subject of the above equation

So, we have

x = 7 * sin(43.2)

Evaluate the products

x = 4.79

Hence, the value of x is 4.79 feet

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The probability that the paint on a sample of 65 test panels will have a mean life before corrosive failure of less than 144 hours is approximately 0.0005 or 0.05%.

To find the probability that the paint on a sample of 65 test panels will have a mean life before corrosive failure of less than 144 hours, we will use the Central Limit Theorem (CLT). The CLT states that the sampling distribution of the sample mean approaches a normal distribution as the sample size increases, regardless of the population distribution.

Given:
- Mean life before corrosive failure (μ) = 155 hours
- Standard deviation (σ) = 27 hours
- Sample size (n) = 65 test panels
- Target mean life before corrosive failure (x) = 144 hours

First, we need to calculate the standard error (SE) of the sample mean:

SE = σ / √n = 27 / √65 ≈ 3.343

Next, we will calculate the z-score for the target mean life of 144 hours:

z = (x - μ) / SE = (144 - 155) / 3.343 ≈ -3.293

Now, we will use the standard normal distribution table or a calculator to find the probability that the sample mean life is less than 144 hours:

P(z < -3.293) ≈ 0.0005

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All the midpoints lie on a vertical line passing through x = 4. This means that the line of reflection is the vertical line x = 4, which corresponds to a reflection across the y-axis.

A polygon is a closed, two-dimensional structure made up of three or more straight line segments in geometry.

Each line segment forms an angle with the next one, and the point where two segments meet is called a vertex of the polygon.

The most common polygons are triangles (3 sides), quadrilaterals (4 sides), pentagons (5 sides), hexagons (6 sides), heptagons (7 sides), octagons (8 sides), and so on. Polygons with more than 10 sides are usually named using the Greek numerical prefixes (e.g., a 12-sided polygon is called a dodecagon).

To determine the line of reflection that maps the polygon ABCDE onto the polygon A' B' C' D' E', we need to identify a line that is equidistant from the corresponding vertices of both polygons. We can start by finding the midpoint between each pair of corresponding vertices:

Midpoint between A(-3, 3) and A'(11, 3) is ((-3 + 11)/2, (3 + 3)/2) = (4, 3)

Midpoint between B(-3, 6) and B'(11, 6) is ((-3 + 11)/2, (6 + 6)/2) = (4, 6)

Midpoint between C(1, 6) and C'(7, 6) is ((1 + 7)/2, (6 + 6)/2) = (4, 6)

Midpoint between D(1, 3) and D'(7, 3) is ((1 + 7)/2, (3 + 3)/2) = (4, 3)

Midpoint between E(-1, 1) and E'(9, 1) is ((-1 + 9)/2, (1 + 1)/2) = (4, 1)

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The 95% confidence interval for the true mean for exam 2 is approximately (60.899, 83.661).

To construct a 95% confidence interval for the true mean for exam 2 using x = 72.28 (sample mean), s = 18.375 (sample standard deviation), and a sample size of n = 10, follow these steps:

1. Identify the sample mean (x), sample standard deviation (s), and sample size (n): x = 72.28, s = 18.375, n = 10.
2. Determine the appropriate critical value (z) for a 95% confidence interval. You can find this value in a z-table or use a standard value: z = 1.96 for a 95% confidence interval.
3. Calculate the standard error (SE) using the formula SE = s/√n: SE = 18.375 / √10 ≈ 5.807.
4. Calculate the margin of error (ME) using the formula ME = z * SE: ME = 1.96 * 5.807 ≈ 11.381.
5. Calculate the lower and upper bounds of the confidence interval using the formulas:
  - Lower bound = x - ME: 72.28 - 11.381 ≈ 60.899.
  - Upper bound = x + ME: 72.28 + 11.381 ≈ 83.661.

Your answer: The 95% confidence interval for the true mean for exam 2 is approximately (60.899, 83.661).

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Answer:

The area of the shaded region is the difference between the area of the entire polygon and the area of the unshaded part inside the polygon. The area of the shaded part can occur in two ways in polygons.

Step-by-step explanation:

Observe that the area of the unshaded region is equal to the area of the shaded region subtracted from the area of the rectangle, i.e. . ar(Unshaded) = ar(ABCD) – ar(Shaded).

please give me brainlist!

Okay, here are the steps to solve this problem:

* There are 10 tenors, 9 sopranos, 20 altos, and 14 basses in the choir

* In total there are 10 + 9 + 20 + 14 = 53 singers

* There are 9 sopranos out of the 53 total singers

* To find the probability of a randomly selected singer being a soprano:

* Probability = (Number of desired outcomes) / (Total possible outcomes)

* So Probability = 9/53

Therefore, the probability that a randomly selected singer will be a soprano is 9/53

Complete compensation= 832 individual items x Rs10/unit coming out to be: Rs. 8320

To determine the aggregate salary of a laborer, we will begin by computing the whole quantity of units manufactured per calendar month and then increase it by the wage rate for each unit.

Total units produced every month:

Monthly business days = 26

Productivity every hour = 4 individual items

Quantity of daily working hours = 8 hours

Units generated in one day = Productivity every hour multiplied by the Quantity of daily working hours

Units generated in one day are equal to 4 units/hour x 8 hours/day totalling= 32 individual items/day

Whole number units made each month = Units produced every day multiplied Monthly occupation days

Entire units produced each calendar month are equivalent to 32 individual items/day x 26 days which equals= 832 individual items/month.

The wage rate obtained receives Rs.10/individual item

Full pay gained is ascertained using Total units produced every month multiplied Wage rate Ruppees/Rs.10 for every unit.

Complete compensation= 832 individual items x Rs10/unit coming out to be: Rs. 8320

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Answer:

$1.720.34

Step-by-step explanation:

to do this problem we can use the exponential growth formula A=p(1+r)^t

substituting our values we get

A = 1,557.00(1+0.02)^5

after solving the equation for A we get that

A after 5 years will be $1,720.34

a. The probability that a Generation X member pays the full amount each month is 0.42.

b. The probability that a Boomer pays the full amount each month is 0.58.

c. The payment each month is not independent of generation.

a. To find the probability that a Generation X member pays the full amount each month, divide the number of Generation X members who pay the full amount by the total number of Generation X members in the sample:

Probability (Generation X pays full amount) = (Number of Generation X who pay full amount) / (Total Generation X members)
= 420 / 1,000
= 0.42

b. To find the probability that a Boomer pays the full amount each month, divide the number of Boomers who pay the full amount by the total number of Boomers in the sample:

Probability (Boomer pays full amount) = (Number of Boomers who pay full amount) / (Total Boomers)
= 580 / 1,000
= 0.58

c. To determine if payment each month is independent of generation, compare the probabilities for both generations. If they are equal, then payment is independent of generation. In this case, the probabilities are different (0.42 for Generation X and 0.58 for Boomers), so payment each month is not independent of generation.

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Answer:

0.24489795918

Step-by-step explanation:

when you divide it give me that number. I hope it helps

The given statement (1/cotx)+cotx = (1/sinxcosx) is true.

What is Trigonometry?

Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles, particularly right triangles, and the functions based on these relationships. It is widely used in various fields such as engineering, physics, architecture, and navigation to calculate distances, heights, angles, and other geometric properties.

Starting with the left-hand side of the equation:

1/cot(x) + cot(x)

= cos(x)/sin(x) + sin(x)/cos(x) [Using the reciprocal identity]

= (cos²(x) + sin²(x))/(sin(x)cos(x))

= 1/(sin(x)cos(x)) [Using the identity sin²(x) + cos²(x) = 1]

Now, we have shown that the left-hand side simplifies to 1/(sin(x)cos(x)).

Now, we can simplify the right-hand side of the equation using the identity sin(2x) = 2sin(x)cos(x):

1/(sin(x)cos(x))

= 1/(1/2 × 2sin(x)cos(x))

= 2/(2sin(x)cos(x))

= 2/sin(2x)

= 1/sin(2x) + 1/sin(2x)

= (sin(x)cos(x))/(sin(x)cos(x)×sin(2x)) + (sin(x)cos(x))/(sin(x)cos(x)×sin(2x))

= (cos(x))/(sin(2x)) + (sin(x))/(sin(2x))

= (cos(x) + sin(x))/(sin(2x))

= (cos²(x) + 2sin(x)cos(x) + sin²(x))/(2sin(x)cos(x))

= (1 + cos(2x))/(2sin(x)cos(x)) [Using the identity cos(2x) = cos²(x) - sin²(x)]

Thus, we have shown that the right-hand side simplifies to (1 + cos(2x))/(2sin(x)cos(x)).

Since we have shown that the left-hand side simplifies to 1/(sin(x)cos(x)) and the right-hand side simplifies to (1 + cos(2x))/(2sin(x)cos(x)), we can see that the given identity is true.

Therefore,1/cot(x) + cot(x) = 1/(sin(x)cos(x)) = (1 + cos(2x))/(2sin(x)cos(x)).

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The two variables y and x need to be in proportion for the equation y=rx to be valid. This implies that y must rise or decrease in a consistent ratio dictated by the value of r when x increases or decreases.

The change in y is therefore directly proportional to the change in x.

Thus, the change that we have can only be represented by the variables in (2) and (3) above.

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Continuing an upward trend, credit card users collectively paid a staggering amount in interest payments.

Anchoring bias is when we focus on the first piece of information presented, which often influences subsequent decision-making.

True: Most Americans tend to use credit cards not for luxury goods

The CARD Act moved credit card companies from a fee-driven model to one that is driven by transparency.

False: Revolving, rather than paying off your credit card every month, can actually hurt your credit score in the long run.

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The exact values using law of negative exponents and reciprocals are:

a) 4⁻¹ = 1/4

b) 2⁻³ = 1/8

c) 3⁻⁴ = 1/81

The law of negative exponents and reciprocals states that:

Any non-zero number that is raised to a negative power will be equal to its reciprocal raised to the opposite positive power. This means that, an expression raised to a negative exponent will be equal to 1 divided by the expression with the sign of the exponent changed.

a) The number is given as: 4⁻¹

Applying the law of negative exponents and reciprocals, we have:

4⁻¹ = 1/4¹

= 1/4

b) The number is given as: 2⁻³

Applying the law of negative exponents and reciprocals, we have:

2⁻³ = 1/2³

= 1/8

c) The number is given as: 3⁻⁴

Applying the law of negative exponents and reciprocals, we have:

3⁻⁴ = 1/3⁴

= 1/81

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Correct question is:

Find the exact values of the following, giving your answers as fractions

a) 4⁻¹

b) 2⁻³

c) 3⁻⁴

Therefore, the explicit formula an = 2n − 1 − 1 satisfies the given recursive formula and generates the sequence with a1 = 0 and an = 2an − 1 + 1 for n ≥ 2.

Let's find an explicit formula for the nth term of the sequence satisfying a1 = 0 and an = 2an-1 + 1 for n ≥ 2.

Step 1: Write down the given information.
a1 = 0
an = 2an-1 + 1 for n ≥ 2

Step 2: Generate the first few terms of the sequence using the recursive formula.
a1 = 0
a2 = 2a1 + 1 = 2(0) + 1 = 1
a3 = 2a2 + 1 = 2(1) + 1 = 3
a4 = 2a3 + 1 = 2(3) + 1 = 7

Step 3: Look for a pattern in the sequence and express it as a formula.
The sequence we have so far is 0, 1, 3, 7. We can see that the sequence is a doubling pattern, where each term is double the previous term plus one:

0, (0*2)+1, (1*2)+1, (3*2)+1, ...

Step 4: Write the explicit formula for the nth term.
Based on the pattern, we can express the explicit formula as:

an = 2^(n-1) - 1

This formula represents the nth term of the sequence satisfying the given conditions.

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The general solution of the given homogeneous differential equation is: y/x = v = f(x^2 - ln|x|)

To solve the homogeneous differential equation (x - y) dx + x dy = 0 using an appropriate substitution, let's substitute

v = y/x. Then, y = xv and differentiate both sides with respect to x to get dy/dx = x dv/dx + v. Now, substitute y and dy/dx into the original equation:

(x - xv) dx + x(x dv/dx + v) dy = 0
(1 - v) dx + x^2 dv/dx + xv dy = 0

Now, divide the equation by x to obtain:

(1 - v) (dx/x) + x dv/dx + v dy = 0

This is now a separable differential equation. Rearrange the terms to separate the variables:

(1 - v) (dx/x) = -x dv/dx - v dy

Integrate both sides:

∫ (1 - v) (dx/x) = ∫ (-x dv - v dy)

∫ (1 - v) (1/x) dx = - ∫ x dv - ∫ v dy

ln|x| - ∫ v (1/x) dx = -xy - 1/2 y^2 + C

Now, substitute y back in terms of x and v:

ln|x| - ∫ v (1/x) (x dv) = -x(xv) - 1/2 (xv)^2 + C

Simplify and solve for v:

ln|x| - ∫ v dv = -x^2v - 1/2 x^2v^2 + C

Finally, write the general solution in terms of x and y:

y/x = v = f(x^2 - ln|x|)

where f is an arbitrary function.

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The general solution to the homogeneous differential equation (d²y/dt²)−18(dy/dt)+97y=0 is y(t) = C₁ [tex]e^3^t[/tex] cos(8t) + C₂ [tex]e^3^t[/tex]sin(8t).

To solve the given differential equation, first, we need to find the characteristic equation by replacing d²y/dt² with r², dy/dt with r, and y with 1. This gives us the quadratic equation r² - 18r + 97 = 0.

Next, find the roots of the characteristic equation using the quadratic formula, which yields r = 3 ± 8i.

Since the roots are complex conjugates, the general solution to the homogeneous differential equation takes the form y(t) = [tex]e^\alpha^t[/tex](C₁cos(βt) + C₂sin(βt)), where α and β are the real and imaginary parts of the complex roots, respectively. In this case, α = 3 and β = 8. Substituting these values, we obtain the general solution y(t) = C₁ [tex]e^3^t[/tex]cos(8t) + C₂ [tex]e^3^t[/tex]sin(8t).

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

y1 = 1 - (1/2)x^2 + (1/24)x^4 - (1/720)x^6 + ...
y2 = x - (1/2)x^2 - (1/16)x^4 - (1/240)x^6 - ...

To use the procedure in Example 8 in Section 6.2 to find two power series solutions of the given differential equation about the ordinary point x=0, we first need to find the coefficients of the power series solutions y1 and y2.

For y1, we have:

y1 = 1 + (1/2)x^2 + (1/6)x^3 + ...

To find the coefficients of y1, we differentiate the power series term by term and substitute into the differential equation:

y'' + exy' - y = 0
2(1/2)(1) + ex(2/2)x + (1/2)(1/2)x^2 + (1/6)x^3 + ... - (1 + (1/2)x^2 + (1/6)x^3 + ...) = 0

Simplifying and collecting like terms, we get:

ex + (1/2)x^2 + (1/6)x^3 + ... = 0

Since ex is an exponential function that cannot be expressed as a power series, we can ignore it in this case. Therefore, we get:

(1/2)x^2 + (1/6)x^3 + ... = 0

Solving for the coefficients, we get:

a1 = 0
a2 = -1/2
a3 = 0
a4 = 1/24
a5 = 0
a6 = -1/720
...

Therefore, y1 = 1 - (1/2)x^2 + (1/24)x^4 - (1/720)x^6 + ...

For y2, we have:

y2 = x + (1/2)x^2 + (1/6)x^3 + (1/24)x^4 + ...

To find the coefficients of y2, we differentiate the power series term by term and substitute into the differential equation:

y'' + exy' - y = 0
2(1/2)x + ex(1 + x) + (1/2)x^2 + (1/6)x^3 + (1/24)x^4 + ... - (x + (1/2)x^2 + (1/6)x^3 + (1/24)x^4 + ...) = 0

Simplifying and collecting like terms, we get:

ex + x^2 + (1/6)x^3 + ... = 0

Since ex is an exponential function that cannot be expressed as a power series, we can ignore it in this case. Therefore, we get:

x^2 + (1/6)x^3 + ... = 0

Solving for the coefficients, we get:

b1 = 0
b2 = -1/2
b3 = 0
b4 = -1/16
b5 = 0
b6 = -1/240
...

Therefore, y2 = x - (1/2)x^2 - (1/16)x^4 - (1/240)x^6 - ...

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

y1 = 1 - (1/2)x^2 + (1/24)x^4 - (1/720)x^6 + ...
y2 = x - (1/2)x^2 - (1/16)x^4 - (1/240)x^6 - ...

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The 99% confidence interval is:

p-hat ± z*SE = = (0.4716, 0.5664)

We can use the formula for calculating confidence intervals for a proportion:

p-hat ± z*SE

where p-hat is the sample proportion, SE is the standard error, and z is the z-score corresponding to the desired level of confidence.

For a 95% confidence interval, the z-score is 1.96 (from a standard normal distribution table).

Using the given values, we have:

p-hat ± z*SE = 0.519 ± 1.96(0.0184) = (0.4829, 0.5551)

To find the 99% confidence interval, we need to use a z-score of 2.576 (from the standard normal distribution table).

So, the 99% confidence interval is:

p-hat ± z*SE = 0.519 ± 2.576(0.0184) = (0.4716, 0.5664)

Therefore, the answer is B. (0.4716, 0.5664).

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By the Integral Test, the series sum_(n=1)^infinity n e⁻³ⁿ also diverges.

Using the Integral Test, we can evaluate the convergence of the series sum_(n=1)^infinity n e⁻³ⁿ.

We can set up the integral as ∫(x=1 to infinity) xe⁻³ˣ dx. Using integration by parts, we can solve the integral as [(-x/3) - (1/9)e⁻³ˣ] from 1 to infinity. Plugging in infinity, we get (-∞/3) - (1/9)e⁻infinity, which is -∞. Therefore, the integral diverges and by the Integral Test, the series sum_(n=1)^infinity n e⁻³ⁿ also diverges.

The Integral Test is a method used to evaluate the convergence of an infinite series by comparing it to an improper integral. The basic idea is that if the integral of the function used to define the series converges, then the series also converges. If the integral diverges, then the series also diverges.

In this case, we set up the integral as ∫(x=1 to infinity) xe⁻³ˣ dx and solved it using integration by parts. When we plugged in infinity, we got -∞, which means the integral diverges.

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Answer:

1. Since ABCD is a rhombus, all sides are congruent.

2. Since △ACB ≅ △DBC, ∠ACB ≅ ∠DBC.

3. Since opposite angles of a parallelogram are congruent, ∠ABC ≅ ∠DCB.

4. Since ∠ACB ≅ ∠DBC and ∠ABC ≅ ∠DCB, then ∠ACB + ∠ABC = ∠DBC + ∠DCB.

5. Since the sum of the angles in a triangle is 180°, then ∠ACB + ∠ABC = 180° and ∠DBC + ∠DCB = 180°.

6. Therefore, ABCD is a rectangle.

7. Since ABCD is both a rhombus and a rectangle, it must be a square.