PLEAS HELP IM GIVING BRAINLIESIT

Mr. Stevenson will need to cover approximately 314 square feet of the patio with concrete sealer.

To calculate the area of a circle, we can use the formula:

Area = π * r^2

where π (pi) is around 3.14, and r is the radius of the circle. In this example, the radius is 10 feet.

Area = 3.14 * (10 ft)^2

Area = 3.14 * 100 sq ft

Area ≈ 314 sq ft

So, Mr. Stevenson will need to cover approximately 314 square feet of the patio with concrete sealer.

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What is the area of a circular patio with a radius of 10 feet, using the approximation of pi as 3.14?

Answer:

$6133.19

Step-by-step explanation:

We can use the formula for compound interest to find the amount of money in Wazin's college account in 2026:

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

where A is the amount of money in the account, P is the principal (initial investment), r is the interest rate (as a decimal), n is the number of times the interest is compounded per year, and t is the time (in years).

In this case, P = $1500, r = 0.07, n = 4 (since the interest is compounded quarterly), and t = 20 (since 2026 is 20 years after 2006). Substituting these values, we get:

A = 1500(1 + 0.07/4)^(4*20) = $6133.19

Therefore, Wazin's college account will have approximately $6133.19 in 2026.

Hope this helps!

Answer:

Step-by-step explanation:

Principal amount, P= $1500 Rate of interest, r = 7%

The particular solution is: y = e^(1/75 x^3 + ln(7)) or equivalently: y = 7e^(1/75 x^3) This is the solution to the separable differential equation dy/dx = x^2/25 that satisfies the initial condition x(0) = 7.

the separable differential equation and find the particular solution.

First, let's rewrite the given equation as a separable equation:
dy/dx = x^2/25

To separate the variables, divide both sides by x^2 and multiply by dx:
(1/x^2) dx = (1/25) dy

Now, integrate both sides with respect to their respective variables:
∫(1/x^2) dx = ∫(1/25) dy

The integrals are:
-1/x = y/25 + C

To find the particular solution satisfying the initial condition x(0) = 7, we need to correct the initial condition, as x(0) should be in the form of y(0) for it to be relevant to our equation. Assuming the correct initial condition is y(7) = 0, let's plug in the values for x and y:

-1/7 = 0/25 + C

Solve for C:
C = -1/7

Now, plug C back into the equation to get the particular solution:
-1/x = y/25 - 1/7

This is the particular solution to the given separable differential equation with the initial condition y(7) = 0.

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The probability of X falling between 5 and 8 is 0.3, and this probability is proportional to the length of the interval.

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The solutions to the equation tan x = -0.4452 in the interval 0° < x < 360° are approximately: x ≈ 157° and x ≈ 337° (rounded to the nearest degree)

To find the values of x in the given interval for which tan x = -0.4452, we can use the inverse tangent function (tan^-1) or a calculator with an inverse tangent function.

Using a calculator with an inverse tangent function, we can take the inverse tangent of -0.4452 to get:

tan^-1(-0.4452) ≈ -23.012°

To get the next solution, we can add 180 degrees to -23.012°:

-23.012° + 180° ≈ 156.988°

Therefore, the two solutions in the interval 0° < x < 360° are approximately:

x ≈ -23.012° and x ≈ 156.988°

Since we want our answers in the interval 0° < x < 360°, we can add 360 degrees to the negative solution to get it in the correct range:

x ≈ 360° - 23.012° ≈ 336.988°

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Answer:

28 ft of fence

Step-by-step explanation:

Area of square  = 196 ft^2

Area of square = Length of one side ^2

Each side of Square = sqrt 196

Each side = 14 ft

2 sides of fence = 2 x 14

= 28 ft

The correct option is D)  n is 30 or larger.

To apply the Central Limit Theorem (CLT) to the sampling distribution of the sample mean, the required sample size depends on the underlying population distribution.

Specifically, the CLT states that as the sample size (n) increases, the sampling distribution of the sample mean becomes approximately normal regardless of the population distribution.

However, there are some general rules of thumb that can be used to determine if the sample size is large enough to apply the CLT:

Therefore, the answer to the question is D) n is 30 or larger.

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The percentage of S&E Bachelor's degrees awarded to women is also 25.31%.


To find the percentage of S&E Bachelor's degrees awarded to women, follow these steps:

Step 1: Calculate the total number of S&E Bachelor's degrees awarded to women.
If 35.1% of S&E degrees are Bachelor's degrees awarded to women, and we know that 72.1% of S&E degrees are Bachelor's degrees, we can set up a proportion:

Step 2: Solve for the percentage of S&E Bachelor's degrees awarded to women.
To solve for the percentage, simply multiply both sides of the equation by 72.1%:

Percentage of S&E Bachelor's degrees awarded to women = 35.1% * 72.1%

Step 3: Calculate the percentage.
Percentage of S&E Bachelor's degrees awarded to women = 0.351 * 0.721 = 0.253071

Step 4: Convert the decimal to a percentage.
0.253071 * 100 = 25.31%

So, 25.31% of S&E Bachelor's degrees were awarded to women.

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The volume of the rectangular prism is 12 3/4 cubic feet. Option C

The formula that is used to calculate the volume of a rectangular prism is expressed as;

V = lwh

Such that the parameters are;

From the information given, we have;

Length = 2 ft

Width = 3/2 feet

height = 17/4 feet

Substitute the values

Volume = 2 × 3/2 × 17/4

volume = 102/8

Volume = 12 3/4 cubic feet

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The final answer is (b), a z-score of 1.645 separates the top 5% from the remainder of the distribution in a normal distribution.

The z-score that separates the top 5% from the remainder of the distribution is found by looking up the area in the standard normal distribution table.

The normal distribution is a continuous probability distribution that is commonly used in statistical analysis. It is a symmetric bell-shaped curve that describes a large number of natural phenomena, such as human heights, test scores, and measurements of physical phenomena. The distribution is characterized by its mean and standard deviation.

The area in the tail of the distribution is 0.05, which corresponds to a z-score of approximately 1.645.

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The SSR can be calculated as:

SSR = SST - SSE

The linear regression analysis i.e., sum of squared residuals (SSR) can be calculated as the difference between the total sum of squares (SST) and the explained sum of squares (SSE).

SST represents the total variation in the data and is calculated as the sum of the squared differences between each data point and the mean of the data:

SST = ∑([tex]yi[/tex] - ȳ)²

where [tex]yi[/tex] is the [tex]i-th[/tex] data point and ȳ is the mean of the data.

SSE represents the variation in the data that is explained by the model and is calculated as the sum of the squared differences between each predicted value and the actual value:

SSE = ∑(yi - ŷi)²

where yi is the i-th actual data point and ŷi is the i-th predicted value from the model.

Then, the SSR can be calculated as:

SSR = SST - SSE

This represents the unexplained variation in the data that is not accounted for by the model.

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The wind tunnel should be operated at a pressure that results in an air density of 0.068 kg/m³ to achieve dynamically similar test conditions. The expected drag force on the full-scale torpedo is 7535 N.

To achieve dynamically similar test conditions, the Reynolds number of the model in the wind tunnel should be the same as the Reynolds number of the prototype in water. The Reynolds number is given by:

Re = (ρvL)/μ

where ρ is the density of the fluid (air or water), v is the velocity, L is a characteristic length (diameter for the torpedo), and μ is the dynamic viscosity of the fluid.

For the prototype in water:

ρ = 1000 kg/m³

v = 28 m/s

L = 6.7 m

μ = 0.001 Pa·s (for water at 20°C)

Re = (1000 kg/m³ × 28 m/s × 6.7 m) / 0.001 Pa·s

Re = 1.876 × 10^8

For the model in the wind tunnel:

v = 110 m/s (maximum speed in wind tunnel)

L = 1/3 × 6.7 m = 2.233 m (scaled length)

μ = 0.0000183 Pa·s (for air at 20°C)

We can solve for the density of air required to achieve the same Reynolds number as the prototype:

ρ = (μRe)/(vL)

ρ = (0.0000183 Pa·s × 1.876 × 10^8) / (110 m/s × 2.233 m)

ρ = 0.068 kg/m³

Therefore, the wind tunnel should be operated at a pressure that results in an air density of 0.068 kg/m³ to achieve dynamically similar test conditions.

To find the drag force on the full-scale torpedo, we can use the drag coefficient of the model in the wind tunnel, assuming it is the same as the full-scale prototype. The drag force is given by:

Fd = 1/2 ρ v² Cd A

where Cd is the drag coefficient and A is the cross-sectional area of the torpedo.

For the model in the wind tunnel:

ρ = 0.068 kg/m³

v = 28 m/s (prototype operating speed)

Cd = (measured drag force on model) / (1/2 ρ v² A)

Cd = 618 N / (1/2 × 0.068 kg/m³ × 28 m/s² × π(533/2 mm)²)

Cd = 0.00744

For the full-scale prototype:

ρ = 1000 kg/m³

v = 28 m/s

A = π(533 mm/2)²

Fd = 1/2 × 1000 kg/m³ × 28 m/s² × 0.00744 × π(533/2 mm)²

Fd = 7535 N

Therefore, the expected drag force on the full-scale torpedo is 7535 N.

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The answer is 10, which corresponds to option (E).

To solve it, let's first analyze the given terms and find a pattern:

1. DOG = 29
2. BAG = 13
3. FEE = 19

Now, let's convert each letter to its corresponding position in the alphabet:
- D = 4, O = 15, G = 7
- B = 2, A = 1, G = 7
- F = 6, E = 5, E = 5

Next, let's look for a pattern in the sums:
1. 4 + 15 + 7 = 26 → 26 + 3 = 29
2. 2 + 1 + 7 = 10 → 10 + 3 = 13
3. 6 + 5 + 5 = 16 → 16 + 3 = 19

It appears that after summing the positions of each letter, we add 3 to get the final result.
Now, let's find the value for DAB:
- D = 4, A = 1, B = 2
- 4 + 1 + 2 = 7 → 7 + 3 = 10
So, the answer is 10, which corresponds to option (E).

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The minimal forms of the Boolean function f=Σ(2,6,8,9,10,12,14,15) are f = A'C + AB' + BC.

To find the minimal forms, follow these steps:

1. Draw a 4-variable Karnaugh map (K-map) with the variables A, B, C, and D.

2. Place 1s in the K-map for each minterm (2,6,8,9,10,12,14,15) and 0s for the remaining cells.

3. Identify prime implicants by grouping 1s in the largest possible power-of-two rectangular groups (1, 2, 4, or 8 cells) with wraparound allowed. The groups must be row- or column-wise adjacent.

4. Determine essential prime implicants by finding groups that contain at least one 1 that is not part of any other group.

5. Combine the essential prime implicants and any additional non-essential prime implicants needed to cover all 1s in the K-map to form the minimal Boolean expressions.

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Answer:

This is false as you can have triangular sequences.

For differential equation dy/dx=e^x−1e^y, the value of f(-2) is ln(2-e^-2) - 2.

To get the value of f(-2), first solve the above differential equation and locate the specific solution y = f(x) that meets the initial condition f(1) = 0.

The variables in the differential equation can be separated to yield:

(e^y - 1)dx = (e^x - 1)dx

When both sides are combined, the following results:

e^y = e^x - x + C

where C is the integration constant. We can solve for C using the beginning condition f(1) = 0.

e^0 = e^1 - 1 + C

C = 1 - e

By reintroducing this value of C into the equation for ey, we obtain:

ey = e^x - x + 1 - e

We get the following when we take the natural logarithm of both sides and solve for y:

y = ln(e^x - x + 1 - e)

We can now calculate the value of f(-2) by entering x = -2:

f(-2) = ln(e^(-2) + 2 - e) - 2

Using the properties of exponents to simplify the formula inside the natural logarithm, we get:

f(-2) = ln(2 - e^-2) - 2

This is the definitive answer to the question of the value of f(-2).

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Complete question - Let y=f(x) be the particular solution to the differential equation dy/dx=e^x−1e^y with the initial condition f(1)=0. What is the value of f(−2) ?

The following can be answered by the concept of Probability.

1. The probability of getting 1 or fewer successes in 8 trials with a success probability of 0.3 is 0.2590.

2. The mean is 2.4.

3. The variance is 1.68 and the standard deviation is 1.296.

1) To determine the probability P(1 or fewer), we need to calculate the probability of getting 0 successes and the probability of getting 1 success, and then add them together.

Using the formula for binomial probability:

P(X = k) = (n choose k) × p^k × (1-p)^(n-k)

Where X is the number of successes, n is the number of trials, p is the probability of success on each trial, and (n choose k) is the binomial coefficient.

For k=0:

P(X=0) = (8 choose 0) × 0.3⁰ × 0.7⁸ = 0.0576

For k=1:

P(X=1) = (8 choose 1) × 0.3¹ × 0.7⁷ = 0.2014

So P(1 or fewer) = P(X=0) + P(X=1) = 0.2590

Therefore, the probability of getting 1 or fewer successes in 8 trials with a success probability of 0.3 is 0.2590.

2) To find the mean, we use the formula:

μ = np

Where μ is the mean, n is the number of trials, and p is the probability of success on each trial.

Plugging in the values, we get:

μ = 8 × 0.3 = 2.4

Therefore, the mean is 2.4.

3) To find the variance, we use the formula:

σ² = np(1-p)

Where σ² is the variance, n is the number of trials, and p is the probability of success on each trial.

Plugging in the values, we get:

σ² = 8 × 0.3 × 0.7 = 1.68

To find the standard deviation, we take the square root of the variance:

σ = √(1.68) = 1.296

Therefore, the variance is 1.68 and the standard deviation is 1.296.

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The correct option is B., that is, Raising prices will decrease city revenue.

To find out what would happen to city revenue if prices are raised, we need to consider the demand function and revenue equation.

The demand function given is P = 100 - 10Q, where P is the price and Q is the quantity demanded.

The revenue equation is R = P*Q, where R is the total revenue earned.

If the current price of a ride is 60, we can find the corresponding quantity demanded by setting P = 60 in the demand function and solving for Q:
60 = 100 - 10Q
10Q = 40
Q = 4

So currently, the city is selling 4 bus rides at a price of 60, which gives a total revenue of:
R = P*Q = 60*4 = 240

Now let's consider what would happen if the price is raised.

For example, if the price is raised to 70, then the demand function becomes:
70 = 100 - 10Q
10Q = 30
Q = 3

So at a price of 70, the city would sell 3 bus rides, which gives a total revenue of:
R = P*Q = 70*3 = 210

Comparing this to the current revenue of 240, we can see that raising prices would decrease city revenue.

Therefore, the correct answer is B. Raising prices will decrease city revenue.

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Answer:

One-third gallon of paint covers 178 ft2 of walls, so 2 gallons of paint will cover:

2 gallons * (178 ft2 / one-third gallon) = 11,880 ft2

Since Alex wants to cover 1,000 ft2, we can write the following statement:

1,000 ft2 ≤ 11,880 ft2

This statement is true, so Alex has enough paint to cover his apartment

2 gallons of paint will cover [ 1,068 ] ft, and Alex will needs to cover 1,000 ft, so he [ will ] have enough paint

1. The equations for Sand, Clay, and Humus, we get: x = (12 - 3y)/4, x = (12 - 6y)/5, x = (10 - 12y)/5 2. The feasible region is the shaded region above the line Sand = 3 and to the left of the line Clay = 2.

What is linear programming?

Linear programming is a mathematical method used to optimize a linear objective function subject to linear constraints.

1. Formulating the problem as a linear programming:

Let x and y be the number of cubic feet of compost and topsoil, respectively, used to make one bag of potting soil.

We want to minimize the cost of the potting soil, which is given by:

Cost = 0.12x + 0.2y

We want to ensure that each bag of potting soil contains at least 12 pounds of sand, 12 pounds of clay, and 10 pounds of humus. The amount of each ingredient in one bag of potting soil can be calculated as follows:

Sand = 4x + 3y

Clay = 5x + 6y

Humus = 5x + 12y

We can now formulate the constraints as follows:

Sand ≥ 12

Clay ≥ 12

Humus ≥ 10

Solving for x and y in the equations for Sand, Clay, and Humus, we get:

x = (12 - 3y)/4

x = (12 - 6y)/5

x = (10 - 12y)/5

We also have the non-negativity constraints:

x ≥ 0

y ≥ 0

2. Plotting the constraints and showing the feasible region:

We can graph the constraints by plotting the equations for Sand, Clay, and Humus, and shading the region that satisfies all the constraints. The resulting feasible region is shown below:

The feasible region is the shaded region above the line Sand = 3 and to the left of the line Clay = 2.

3. Identifying the optimal solution:

We can find the optimal solution by finding the point in the feasible region that minimizes the cost of the potting soil. This point occurs where the cost function is minimized.

Cost = 0.12x + 0.2y

Substituting x = (12 - 3y)/4 and x = (12 - 6y)/5, we get:

Cost = 0.12[(12 - 3y)/4] + 0.2y

Cost = 0.12[(12 - 6y)/5] + 0.2y

Simplifying, we get:

Cost = 0.6 - 0.09y

Cost = 0.72 - 0.044y

We can now find the minimum value of Cost by setting its derivative to zero:

dCost/dy = -0.09 + 0.044 = 0

Solving for y, we get:

y = 2

Substituting y = 2 into x = (12 - 3y)/4 and x = (12 - 6y)/5, we get:

x = 3/4

x = 6/5

Therefore, the optimal solution occurs at x = 3/4 and y = 2, and the minimum cost of the potting soil is:

Cost = 0.12x + 0.2y = 0.12(3/4) + 0.2(2) = 0.39 dollars.

4. Interpreting the optimal solution:

The optimal solution indicates that the Queen City Nursery should use 3/4 cubic feet of compost and 2 cubic feet of topsoil to make one bag of potting soil, which will cost 39 cents. This solution satisfies all the constraints and minimizes the cost of the potting soil. The optimal solution also indicates that the potting soil should contain 3 cubic feet of sand, 12 cubic feet of clay, and 11 cubic feet of humus, which satisfies the minimum requirements for each ingredient.

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The lower bound of the series solution for the radius of convergence about the point x0 = −1 is -2 < x < 0, about the point x0 = 0 is -1 < x < 1, and about the point x0 = 1 is 0 < x < 2.

To determine a lower bound of the series solution for the radius of convergence about the point x0 = −1, x0 = 0, and x0 = 1, we can use the formula for the radius of convergence:
[tex]R = 1/lim sup (|an|^{(1/n)})[/tex]
where an is the nth coefficient of the power series.

For x0 = -1, we consider the power series centered at x0 = -1.

Let the power series be:
∑an(x+1)ⁿ

Then, we can use the ratio test to find the lim sup:
lim sup |an(x+1)ⁿ / a(n-1)(x+1)ⁿ⁻¹| = |x+1|

Therefore, the radius of convergence is:
[tex]R = 1/lim sup (|an|^{(1/n)}) = 1/lim sup (|x+1|^{(1/n)}) = 1[/tex]

So the series converges for all x such that |x+1| < 1, or -2 < x < 0.

For x0 = 0, we consider the power series centered at x0 = 0.

Let the power series be:
∑anxⁿ

Then, we can use the ratio test to find the lim sup:
lim sup |anxⁿ / a(n-1)xⁿ⁻¹| = |x|

Therefore, the radius of convergence is:
[tex]R = 1/lim sup (|an|^{(1/n)}) = 1/lim sup (|x|^{(1/n)}) = 1[/tex]

So the series converges for all x such that |x| < 1.

For x0 = 1, we consider the power series centered at x0 = 1.

Let the power series be:
∑an(x-1)ⁿ

Then, we can use the ratio test to find the lim sup:
lim sup |an(x-1)ⁿ / a(n-1)(x-1)ⁿ⁻¹| = |x-1|

Therefore, the radius of convergence is:
[tex]R = 1/lim sup (|an|^{(1/n)}) = 1/lim sup (|x-1|^{(1/n)}) = 1[/tex]

So, the series converges for all x such that |x-1| < 1, or 0 < x < 2.

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The equation of the tangent plane to the surface z = 1 + y at the point P(1, 3, 2) is z = y - 1 with coefficients accurate to at least 2 significant figures.

To find the tangent plane to the surface z = 1 + y at the point P(1, 3, 2), we need to calculate the partial derivatives with respect to x and y, and then use the equation of the plane.

Step 1: Find the partial derivatives.
∂z/∂x = 0 (since there's no x term in the equation)
∂z/∂y = 1 (the coefficient of y is 1)

Step 2: Use the point-slope form of the equation of the plane.
z - z0 = (∂z/∂x)(x - x0) + (∂z/∂y)(y - y0)

Step 3: Substitute the point P(1, 3, 2) and the partial derivatives into the equation.
z - 2 = (0)(x - 1) + (1)(y - 3)

Step 4: Simplify the equation.
z - 2 = y - 3

Step 5: Rearrange the equation to find the equation of the tangent plane.
z = y - 1

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a)Using the Trapezoidal Rule with n=4: T4 = 1.06450

b)Using the Midpoint Rule with n=4: M4 = 1.14750

c)M4 overestimates the area while T4 underestimates the area

d) The true value of the integral is T4<∫10cos(x2)dx and M4<∫10cos(x2)dx

What is Trapezoidal Rule?

The Trapezoidal Rule is a numerical integration method that approximates the area under a curve by approximating it with a series of trapezoids and summing their areas.

According to the given information:

(a) Using the Trapezoidal Rule with n=4:

Δx = (1-0)/4 = 0.25

f(0) = cos(0) = 1

f(0.25) = cos(0.0625) ≈ 0.998

f(0.5) = cos(0.25) ≈ 0.968

f(0.75) = cos(0.5625) ≈ 0.829

f(1) = cos(1) ≈ 0.540

T4 = Δx/2 * [f(0) + 2f(0.25) + 2f(0.5) + 2f(0.75) + f(1)]

≈ 0.25/2 * [1 + 2(0.998) + 2(0.968) + 2(0.829) + 0.540]

≈ 1.06450

(b) Using the Midpoint Rule with n=4:

Δx = (1-0)/4 = 0.25

x1 = 0 + Δx/2 = 0.125

x2 = 0.125 + Δx = 0.375

x3 = 0.375 + Δx = 0.625

x4 = 0.625 + Δx = 0.875

f(x1) = cos(0.015625) ≈ 0.999

f(x2) = cos(0.140625) ≈ 0.985

f(x3) = cos(0.390625) ≈ 0.921

f(x4) = cos(0.765625) ≈ 0.685

M4 = Δx * [f(x1) + f(x2) + f(x3) + f(x4)]

≈ 0.25 * [0.999 + 0.985 + 0.921 + 0.685]

≈ 1.14750

(c) Looking at a sketch of the graph of the integrand, it appears that the function is decreasing on the interval [0,1], so the area under the curve should be decreasing. The Midpoint Rule tends to overestimate the area under a decreasing curve, while the Trapezoidal Rule tends to underestimate it. Therefore, the answers are:

M4 overestimates the area

T4 underestimates the area

(d) We can conclude that the true value of the integral is between the estimates given by the Trapezoidal Rule and the Midpoint Rule, since the Trapezoidal Rule underestimates and the Midpoint Rule overestimates. Therefore, we can say:

E. T4<∫10cos(x2)dx and M4<∫10cos(x2)dx

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The number of days it would take 7 workers to be able to build a similar house would be 76 days.

Proportionally speaking, more builders means a house will take less time to be built. If the number of workers reduces therefore, the number of days for the house to be built will increase.

We need k which is the constant of proportionality:

k = 19 x 28 = 532

The number of days it would take 7 workers is:

532 = d x 7

d = 532 / 7

= 76 days

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The combination expression 5c3 when evaluated has a value of 10

The notation 5C3 represents the number of ways to choose 3 items from a set of 5 distinct items, without regard to order. This is calculated using the formula:

nCk = n! / (k! * (n-k)!)

where n is the total number of items and k is the number of items to choose.

Using this formula, we have:

5C3 = 5! / (3! * (5-3)!)

= 5! / (3! * 2!)

= (5 * 4 * 3 * 2 * 1) / ((3 * 2 * 1) * (2 * 1))

= 10

Therefore, 5C3 = 10.

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The t-value associated with a lower tail area of 0.05 and 50 degrees of freedom is -1.676.

To find the t-value for a lower tail area of 0.05 with 50 degrees of freedom, you would typically consult a t-distribution table.

Since your table only goes up to 30 degrees of freedom, you can use online tools or statistical software to find the required value.

Here are the steps to find this value without a chart:

1. Use an online t-distribution calculator, statistical software, or a spreadsheet program that has built-in statistical functions.

2. Input the necessary information:

degrees of freedom (50) and the tail area (0.05 for a one-tailed test).

3. The calculator or software will provide the t-value, which in this case is -1.676.

Remember that the negative sign indicates that the t-value falls in the lower tail of the distribution.

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Answer: 0

Step-by-step explanation:

The slope of any horizontal line is 0

Step-by-step explanation:

When x = 0 the value is   1

when x = -1   value is 0

- | - x |  +1

Your answer: a. When you do not know the standard deviation of a normally distributed population.

a. When you do not know the standard deviation of a normally distributed population, you would use the t-distribution procedure to find the confidence interval for the population mean. This is because the t-distribution allows for the estimation of the population standard deviation based on the sample standard deviation.

In statistics, the standard deviation is a measure of the variability or spread of an outcome. [1] A low standard deviation indicates that the value is close to the mean of the cluster (also called the expected value), while a high standard deviation indicates that the results are very interesting.

The standard deviation of can be abbreviated as SD and is often used in mathematics and equations with the Greek letter σ (sigma) for population standard deviation or the Latin letter s for different sample sizes.

The standard deviation of a variable, such as a population, a data set, or a probability, is the basis of its variance. Algebraically it is easier than the mean absolute difference, but in practice, it means a lower absolute difference. The useful feature of standard deviation is that it is expressed in the same unit as the data, not the difference.

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If the cube with 2.00 m wide and 2.00 m long and 2.00 m high has a weight of 900.00 n, then the cube exerts a pressure of 225 N/m².

To calculate the pressure exerted by the cube, follow these steps:

Step 1: To calculate the pressure exerted by the cube,  you need to consider its weight and the area over which it is exerting the force. The cube has a weight of 900 N and dimensions of 2.00 m x 2.00 m x 2.00 m.

Step 2: To find the pressure, we will use the formula:

Pressure (P) = Force (F) / Area (A)

Step 3: In this case, the force is the weight of the cube (900 N), and the area is the base of the cube (2.00 m x 2.00 m).

A = 2.00 m * 2.00 m = 4.00 m²

Step 4: Now, you can calculate the pressure:

P = 900 N / 4.00 m² = 225 N/m²

So, the cube exerts a pressure of 225 N/m².

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