Kelly draws a rectangle. How many square corners does Kelly's rectangle have?


Choose the answer that makes the statement true. Kelly's rectangle has

Choose. Square corners

Answer:

Answer in the picture.

Step-by-step explanation:

In Picture.

Answer:

The graph of the absolute value is described in the image .

The measure of the arc is:

x = 120°

The arc of a circle is the part or segment of the circumference of a circle. A straight line drawn by connecting the two ends of the arc is called chord of a circle.

Check the attached image for labeling.

y = 180° (semicircle)

The measure of inscribed angle is half the measure of its intercepted arc. That is:

30° = 1/2 * U

U = 2 * 30

U = 60°

x = 360 - U - y  (sum of angles in a circle is 360°)

x = 360 - 60 - 180

x = 120°

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The domain of the function is given as follows:

x > 0.

The function in this problem is defined for values of x to the right of x = 0, hence the domain is given as follows:

x > 0.

The graph is given by the image presented at the end of the answer.

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The answer is , The braking distance of the Cadillac Escalade that corresponds to z=1.2 is approximately 166.14 feet. The option is (a) .

Given that the mean stopping distance is 157.5 feet and the standard deviation is 7.2 feet.

We need to find the braking distance of the Cadillac Escalade that corresponds to z=1.2.

Because the distribution is normal, we can use the z-score formula to find the corresponding braking distance:

z=(x-μ)/σ

where z=1.2, μ=157.5, and σ=7.2

We can solve for x by rearranging the equation:

x = zσ + μx

= 1.2(7.2) + 157.5x

= 8.64 + 157.5x

= 166.14

The braking distance of the Cadillac Escalade that corresponds to z=1.2 is approximately 166.14 feet.

Therefore, the correct option is (a) 166.14 feet.

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The solution of the given initial value problem is y(r) = (1/9) cos(3r) + (1/9) sin(3r) - (1/9) sin(3r) = (1/9) cos(3r)

We are given the initial value problem:

d^2y/dr^2 + 9y = sin(3r), y(0) = y'(0) = 0 ---------(1)

We can write the characteristic equation for the given differential equation as:

r^2 + 9 = 0

The roots of the characteristic equation are: r = 0 ± 3i

So, the general solution of the homogeneous differential equation d^2y/dr^2 + 9y = 0 is:

y_h(r) = c1 cos(3r) + c2 sin(3r) ------------(2)

Now, we will find the particular solution of the given differential equation. We use the method of undetermined coefficients and assume the particular solution to be of the form:

y_p(r) = A sin(3r) + B cos(3r)

Differentiating y_p(r) w.r.t r, we get:

y_p'(r) = 3A cos(3r) - 3B sin(3r)

Differentiating y_p'(r) w.r.t r, we get:

y_p''(r) = -9A sin(3r) - 9B cos(3r)

Substituting these values in the differential equation (1), we get:

-9A sin(3r) - 9B cos(3r) + 9(A sin(3r) + B cos(3r)) = sin(3r)

Simplifying the above equation, we get:

-9A sin(3r) + 9B cos(3r) = sin(3r)

Comparing the coefficients of sin(3r) and cos(3r) on both sides, we get:

-9A = 1 and 9B = 0

Solving the above equations, we get:

A = -(1/9) and B = 0

So, the particular solution of the given differential equation is:

y_p(r) = -(1/9) sin(3r)

Therefore, the general solution of the given differential equation is:

y(r) = y_h(r) + y_p(r) = c1 cos(3r) + c2 sin(3r) - (1/9) sin(3r) ------------(3)

Now, we will apply the initial conditions to find the values of c1 and c2.

Given that y(0) = 0. Substituting r = 0 in equation (3), we get:

c1 - (1/9) = 0

So, c1 = 1/9

Differentiating equation (3) w.r.t r, we get:

y'(r) = -3c1 sin(3r) + 3c2 cos(3r) - (1/3) cos(3r)

Given that y'(0) = 0. Substituting r = 0 in the above equation, we get:

3c2 = (1/3)

So, c2 = (1/9)

Therefore, the solution of the given initial value problem is:

y(r) = (1/9) cos(3r) + (1/9) sin(3r) - (1/9) sin(3r) = (1/9) cos(3r)

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Taking the data into consideration, the function would be C(x) = 2x + 28, and Harry would have to pay $52 if he were to take 12 classes, as seen below.

Taking the information provided in the prompt into consideration, the cost Harry has to pay for the gym membership and fitness classes can be represented by the following function:

C(x) = 2x + 28

Where x is the number of fitness classes he takes, and C(x) is the total cost he has to pay. If Harry takes 12 classes, then we can substitute x = 12 into the function:

C(12) = 2(12) + 28

C(12) = 24 + 28

C(12) = 52

Therefore, Harry has to pay a total of $52 if he takes 12 classes.

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Harry pays $28 for a one month gym membership and has to pay $2 for every fitness class he takes. This is represented by the following function, where x is the number of classes he takes.

What is the total amount Harry has to pay if he takes 12 classes?

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The correct equivalent expression is,

⇒ - 3 (2x - 3y)

We have to given that;

Expression is,

⇒ - 6x + 9y

Now, We can simplify as;

⇒ - 6x + 9y

⇒ - 3 (2x - 3y)

Thus, The correct equivalent expression is,

⇒ - 3 (2x - 3y)

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Which expression is equivalent to −6x + 9y?

A) −3(2x + 3y)

B) −3(2x − 3y)

C) 3(2x − 3y)

D) −3(2x + 9)

The attached is a graph of y = tan (x + 90°) - 1. The graph will exhibit the periodic nature of the tangent function, with oscillations between positive and negative values.

The function y = tan(x) represents the tangent function, which is a periodic function that oscillates between positive and negative infinity as x increases or decreases. The tangent function has vertical asymptotes at intervals of π radians (or 180°).

In the given equation y = tan(x + 90°) - 1, the entire function is shifted to the left by 90°. This means that for each x value, we are evaluating the tangent of x + 90°.

The -1 term in the equation shifts the graph downward by 1 unit.

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The surface area of the right octagonal pyramid would be =27.28yrd².

To calculate the surface area of the given shape, the formula that should be used would be given below as follows:

Surface area (SA) = 2 ×s× 2 ( 1 + 2 ) + 4 s h

Where;

s = 1.24

h = 2.5

SA = 2× 1.24×2(1+2)+4×1.24×2.5

= 14.88+12.4

= 27.28yrd²

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a) the vertices are (9, 0) and (-3, 0).

the foci are (3 ± 2√10, 0)

the asymptotes are y = ±x/3 - 1

b) the equation of the ellipse is x² + (y-√5/2)² = 5/4

a)  To find the foci, vertices, and asymptotes of the ellipse (x - 3)² - 9y² = 36, we can first divide both sides by 36 to get:

[tex]\frac{(x-3)^2}{36} - \frac{y^2}{4}=1[/tex]

Therefore, the center of the ellipse is (3, 0).

The semi-major axis length is √36 = 6, and the semi-minor axis length is √4 = 2.

Therefore, the vertices are (3 ± 6, 0) = (9, 0) and (-3, 0).

The foci are located at a distance of √(6²-2²) = 2√10 from the center along the major axis. Therefore, the foci are (3 ± 2√10, 0) and the equation of the major axis is x = 3.

To find the asymptotes, we will use the formula:

[tex]\frac{y-k}{b} = \pm\frac{x-h}{a}[/tex]

where (h, k) is the center of the ellipse, a is the length of the semi-major axis, and b is the length of the semi-minor axis. Therefore, the equations of the asymptotes are:

(y-0)/2 = ±(x-3)/6

y = ±x/3 - 1

b) To find the equation of the ellipse with foci (0, 2) and semi-major axis length 3, we can first find the center of the ellipse. Since the foci are located on the y-axis, the center must also be located on the y-axis. Therefore, the center is (0, c), where c is the distance between the center and one of the foci.

Since the semi-major axis length is 3, the distance between the center and one of the vertices is 3. Therefore, we have:

c² + (3/2)² = (3/2+2)²

c² = 5/4

Therefore, the center of the ellipse is (0, √5/2). The distance between the center and one of the foci is √5/2 - 2. Therefore, the distance between the center and one of the vertices is √{(√5/2)² - (√5/2 - 2)²} = √5.

Therefore, the semi-minor axis length is √5/2, and the equation of the ellipse is:

[tex]\frac{x^2}{\frac{5}{4} } +\frac{(y-\frac{\sqrt{5}}{2} )^2}{\frac{5}{4} } =1[/tex]

x² + (y-√5/2)² = 5/4

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The function is decreasing and at a maximum at t=2.

At t=2, the function C(t)=15te-.4t evaluates to approximately 9.42. To determine whether the function is at the inflection point, increasing, at a maximum, or decreasing, we need to examine its first and second derivatives. The first derivative is C'(t) = 15e-.4t(1-.4t) and the second derivative is C''(t) = -6e-.4t.
At t=2, the first derivative evaluates to approximately -2.16, indicating that the function is decreasing. The second derivative evaluates to approximately -3.03, which is negative, confirming that the function is concave down. Therefore, the function is decreasing and at a maximum at t=2.

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The required answer is every 5 times we roll the dice and don't get a sum of 7, we can expect to get a sum of 7 once.

To find the probability of odds against a sum of 7 when rolling a pair of dice one time, we need to first determine the number of ways to get a sum of 7 versus the number of ways to get any other sum.
There are a total of 36 possible outcomes when rolling a pair of dice, as there are six possible outcomes for each die (1, 2, 3, 4, 5, or 6). To get a sum of 7, there are 6 possible combinations: 1+6, 2+5, 3+4, 4+3, 5+2, and 6+1. Therefore, the probability of rolling a sum of 7 is 6/36 or 1/6.

To find the odds against rolling a sum of 7, we can use the formula:
Odds against = (number of ways it won't happen) : (number of ways it will happen)
So the number of ways it won't happen (i.e. rolling any sum other than 7) is 36-6, or 30. Therefore, the odds against rolling a sum of 7 are:
Odds against = 30 : 6
Simplifying, we get:
Odds against = 5 : 1
This means that for every 5 times we roll the dice and don't get a sum of 7, we can expect to get a sum of 7 once.

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(a) The sketch of the plane curve with the given vector equation is illustrated below.

(b) The resulting picture is a curve in the xy-plane with the position vector r(37/4) and the tangent vector r'(37/4) at that point.

(c) The sketch of the position vector r(t) and the tangent vector r'(t) for the given value of t is illustrated below.

To find r'(t), we need to take the derivative of r(t) with respect to t. Since the coefficients of i and j are functions of t, we need to use the chain rule. The result is r'(t) = 4 cos(t)i + 2 sin(t)j. This vector represents the tangent vector to the curve at the point r(t) for any given value of t.

Now, let's sketch the curve together with the position vector r(t) and the tangent vector r'(t) for t = 37/4.

To do this, we can plot the point (4sin(37/4), -2cos(37/4)) on the xy-plane and draw a vector from the origin to this point, which represents r(37/4). We can also draw a tangent vector to the curve at this point, which represents r'(37/4).

Since

=> r'(37/4) = 4cos(37/4)i + 2sin(37/4)j,

we can plot this vector starting at the point r(37/4) and extending in the direction of the vector.

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Complete Question:

Consider the vector equation r ( t ) = 4 sin t i − 2 cos t j , t = 3 π / 4 .

(a) Sketch the plane curve with the given vector equation.

(b) Find r'(t).

(c) Sketch the position vector r(t) and the tangent vector r'(t) for the given value of t.

To calculate the equal monthly payments for a 6-year, $50,000 loan at a nominal annual interest rate of 10% compounded monthly, we can use the formula for the monthly payment on a loan:

P = (r(PV))/(1 - (1 + r)^(-n))

where P is the monthly payment, r is the monthly interest rate (which is the nominal annual rate divided by 12), PV is the present value of the loan (which is $50,000), and n is the total number of monthly payments (which is 6 years times 12 months per year, or 72).

First, we need to calculate the monthly interest rate:

r = 0.10/12 = 0.0083333

Next, we can substitute these values into the formula to calculate the monthly payment:

P = (0.0083333(50000))/(1 - (1 + 0.0083333)^(-72)) = $843.86

Therefore, the equal monthly payments for this loan would be $843.86, starting at the end of the first month.

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Okay, let's solve this step-by-step:

* The central angle measures (2pi)/3 radians

* Converting to degrees: (2pi)/3 radians = (2*3.14)/3 = 120 degrees

* The radius of the circle is 6 cm

To find the length of an arc intercepted by an angle (in degrees) and radius, we use the formula:

Arc Length = (Degrees * pi * Radius) / 180

So in this case:

Arc Length = (120 * 3.14 * 6) / 180 = 36 cm

Therefore, the length of the arc intercepted by the central angle is 36 cm.

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The height of the cuboidal box with a length of 28.5 cm, breadth of 16.5 cm, and a lateral surface area of 1350 sq.cm is 15 cm.

In order to calculate the height of the cuboidal box, we will need to apply the formula that describes how to calculate the lateral surface area of a cuboid. This equation is written as LSA = 2lh + 2bw + 2lh, where l stands for the length of the cuboid, b stands for the width of the cuboid, and h stands for the height of the cuboid.

The following numbers can be inserted into the formula in light of the fact that the lateral surface area (LSA) measures 1350 square cm:

1350 = 2(28.5h) + 2(16.5h)

In order to simplify the problem, consider the following:

1350 = 57h + 33h

1350 = 90h

After dividing each side by 90 degrees, we obtain the following results:

h = 15 cm

The cuboidal box ends up having a height of 15 centimetres as a consequence of this.

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Computing the vector assigned to the points P=(0,6,-3) and Q=(9,1,0) by the vector field F(P)=F(Q) is that we can estimate the vectors based on assumptions about the smoothness and continuity of the vector field, and nearby points.

To compute the vector assigned to the points p=(0,6,-3) and q=(9,1,0) by the vector field f=F(P)=F(Q), we need to evaluate the vector field at each point.

The vector field F(P) tells us the direction and magnitude of the vector at point P.

In this case, we don't have a specific formula for the vector field, so we can't simply plug in the coordinates of P and Q to get the vectors.

However, we can make an educated guess based on the given points.

Looking at the coordinates of P and Q, we can see that they are not aligned along any of the coordinate axes.

This suggests that the vector field may be twisting or curving in some way.

Without more information, we can't say for sure what the vector field looks like, but we can make some assumptions and use our intuition.

One possible assumption is that the vector field is smooth and continuous, meaning that the vectors at nearby points are similar in direction and magnitude.

If we assume this, we can estimate the vectors at P and Q by looking at the nearby points.

For example, we can look at the points (1,6,-3) and (0,5,-3) that are close to P. The vector from P to (1,6,-3) is (1,0,0), and the vector from P to (0,5,-3) is (0,-1,0).

These vectors suggest that the vector field is pointing slightly to the right and slightly down at P.

Similarly, we can look at the points (9,2,0) and (9,1,-1) that are close to Q. The vector from Q to (9,2,0) is (0,1,0), and the vector from Q to (9,1,-1) is (0,0,1).

These vectors suggest that the vector field is pointing slightly up and slightly forward at Q.

Based on these assumptions and estimates, we can assign approximate vectors to P and Q:

- The vector at P is approximately (-0.5,-0.5,0.5), pointing slightly to the right, slightly down, and slightly forward.
- The vector at Q is approximately (0,0.5,0.5), pointing slightly up and slightly forward.


In summary, the long answer to the question of computing the vector assigned to the points P=(0,6,-3) and Q=(9,1,0) by the vector field F(P)=F(Q) is that we can estimate the vectors based on assumptions about the smoothness and continuity of the vector field, and nearby points.

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I think you may have accidentally cut off the question. Can you please provide the full question so that I can assist you better?

Hence, the balance in one year if interest is compounded annually is $1030.

Given that:

A savings account pays a 3% nominal annual interest rate and has a balance of $1,000. Any interest earned is deposited into the account and no further deposits or withdrawals are made.

We need to write an expression that represents the balance in one year if interest is compounded annually.

The formula for compound interest is given by

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

Where:

A = the future value of the investment/loan, including interest

P = the principal investment amount (the initial deposit or loan amount)

r = the annual interest rate (decimal)n = the number of times that interest is compounded per year

For annual compounding, n = 1t = the number of years the money is invested or borrowed

Substituting the values in the formula, we get;

A = $1000(1 + 0.03/1)^(1*1)

A = $1000(1.03)

A = $1,030

Therefore, the expression that represents the balance in one year if interest is compounded annually is A = $1000(1 + 0.03/1)^(1*1).

A savings account is a deposit account that earns interest and helps you save money. This savings account pays a nominal annual interest rate of 3% compounded annually. The nominal rate is the rate that does not include the effect of compounding. It is the stated rate of interest earned in one year.

The balance of the account is $1000. The expression that represents the balance in one year if interest is compounded annually is given by the formula:

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

Where,

P = principal amount

= $1000

r = nominal annual interest rate

= 3%

n = number of times interest is compounded per year = 1t

= time in years

= 1

Using the values in the formula, we get:

A = $1000 (1 + 0.03/1)^(1*1)

A = $1030

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Apologies, but I cannot create or display visual content like scatterplots. However, I can still provide you with guidance on the other questions.

a) To determine whether a linear model is appropriate, you would need to examine the scatterplot. A linear model would be appropriate if the data points appear to form a roughly straight line pattern. If the points deviate significantly from a straight line or exhibit a nonlinear trend, a linear model may not be suitable.

b) To find the equation for the line of best fit (also known as the regression line), you would typically use statistical software or calculators capable of performing linear regression analysis on the given data. The equation would be in the form of y = mx + b, where y represents the weight and x represents the time during the feeding trial.

c) The slope of the line of best fit represents the rate of change in weight with respect to time. A positive slope indicates an increase in weight over time, while a negative slope would indicate a decrease. The magnitude of the slope reflects the steepness of the line and indicates the rate at which the weight is changing.

d) Without the equation for the line of best fit, it's not possible to provide an accurate prediction of the alligator's weight at week 52. However, once you have the equation, you can substitute x = 52 into the equation to calculate the predicted weight at that time point.

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The exponential equation of 4 = ln x is [tex]e^{4} = x\\[/tex]

The ln equation

ln x = 4

The ln equation is written in the form

[tex]ln_{b} x = y[/tex]

According to the logarithm rule

[tex]b^{y} = x[/tex]

condition of the rule are x > 0, b > 0 and b ≠ 0

Here b = e , y = 4 and x = x

Natural log ln have base e  

[tex]e^{4} = x[/tex]

About logarithm - A logarithm is the opposite of a power. In other words, if we take a logarithm of a number, we undo an exponentiation. The logarithmic function log x is the inverse function of the exponential function .

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1. Ratio estimation:

Let X be the total weight of juice that can be extracted from the shipment. Then, we can use the ratio of the total weight of juice extracted from the sample to the total weight of apples in the sample to estimate X.

The ratio estimator is given by:

R = (∑wᵢ) / (∑xᵢ)

where wᵢ is the weight of the apple's juice for the ith apple in the sample, and xᵢ is the weight of the ith apple in the sample.

Using the data provided, we have:

∑wᵢ = 0.18 + 0.25 + 0.19 + 0.21 + 0.24 = 1.07

∑xᵢ = 0.26 + 0.41 + 0.3 + 0.32 + 0.33 = 1.62

So, the ratio estimator is:

R = 1.07 / 1.62 ≈ 0.661

The total weight of juice that can be extracted from the shipment is then estimated as:

X = R × 1000 = 0.661 × 1000 = 661 pounds

2. 95% confidence interval for the total weight of juice:

The standard error of the ratio estimator is given by:

SE(R) = √(R² / n) × √((N - n) / (N - 1))

where n is the sample size (5), N is the population size (assumed to be large), and √ denotes square root.

Using the data provided, we have:

SE(R) = √(0.661² / 5) × √(995 / 999) ≈ 0.081

The 95% confidence interval for the total weight of juice is then given by:

X ± t(0.025, 4) × SE(R)

where t(0.025, 4) is the t-value for a two-tailed test with degrees of freedom equal to the sample size minus one (4) and a significance level of 0.025.

Using a t-table, we find that t(0.025, 4) ≈ 2.776.

Substituting the values, we get:

CI = 661 ± 2.776 × 0.081

CI ≈ (660.8, 661.2)

So, the 95% confidence interval for the total weight of juice is approximately (660.8, 661.2) pounds.

3.The 95% confidence interval for the average weight of the juice that can be extracted from one pound of apple from this shipment is calculated as follows:

- First, we calculate the sample mean of the weight of the apple's juice:

   X = (0.18 + 0.25 + 0.19 + 0.21 + 0.24) / 5 = 0.214 pounds

- Next, we calculate the sample standard deviation of the weight of the apple's juice:

   s = sqrt(((0.18 - 0.214)^2 + (0.25 - 0.214)^2 + (0.19 - 0.214)^2 + (0.21 - 0.214)^2 + (0.24 - 0.214)^2) / (5 - 1)) = 0.0254 pounds

- Then, we calculate the standard error of the sample mean:

   SE = s / sqrt(n) = 0.0254 / sqrt(5) = 0.01136 pounds

- Finally, we construct the 95% confidence interval using the formula:

  X ± tα/2, n-1 * SE

   where tα/2, n-1 is the t-value for a 95% confidence interval with 4 degrees of freedom (n-1 = 5-1 = 4) = 2.776.

   Therefore, the 95% confidence interval for the average weight of the juice that can be extracted from one pound of apple from this shipment is:

   0.214 ± 2.776 * 0.01136 = [0.182, 0.246] pounds.

So, we can say with 95% confidence that the true average weight of the juice that can be extracted from one pound of apple from this shipment lies between 0.182 and 0.246 pounds.

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Thus, S recursively as follows:
Base case: 2 is in S.
Recursive step: If n is in S, then n2 and 2n are also in S.

A recursive definition for the set of all positive integers that have a 2 as at least one of its digits can be created as follows. Let S be the set of all positive integers that have a 2 as at least one of its digits.

Base case: The number 2 is in the set S.

Recursive step: For any n in S, we can obtain a new number in S by adding 2 as a digit to the left of n, or by appending 2 to the right of n. This means that any number in S can be obtained by starting with 2 and applying the recursive step a finite number of times.

Thus, we have defined S recursively as follows:

Base case: 2 is in S.
Recursive step: If n is in S, then n2 and 2n are also in S.

This recursive definition ensures that any positive integer that has a 2 as at least one of its digits can be generated by starting with 2 and applying the recursive step a finite number of times. It also ensures that every number generated in this way will have a 2 as at least one of its digits.

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[tex](x - 4)^2 + y^2 = 4[/tex] is the equation of the given circle.

As we can see in the graph that the radius of the circle is 2 units and the circle is passing through the point (4, 0).

To find the equation of a circle, we need the center coordinates (h, k) and the radius (r). In this case, the radius is given as 2 units, and the circle passes through the point (4, 0).

The center of the circle can be found by taking the coordinates of the given point. In this case, the x-coordinate of the point (4, 0) represents the horizontal position of the center.

Center coordinates: (h, k) = (4, 0)

Now, we can write the equation of the circle using the formula:

[tex](x - h)^2 + (y - k)^2 = r^2[/tex]

Substituting the values into the equation, we get:

[tex](x - 4)^2 + (y - 0)^2 = 2^2[/tex]

Simplifying further, we have:

[tex](x - 4)^2 + y^2 = 4[/tex]

Therefore, the equation of the circle with a radius of 2 units, passing through the point (4, 0), is [tex](x - 4)^2 + y^2 = 4[/tex].

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The hydronium-ion concentration of a 0.210 M oxalic acid (H₂C₂O₄) solution is approximately 1.06 × 10⁻² M.

To find the hydronium-ion concentration, follow these steps:

1. Determine the initial concentration of oxalic acid (H₂C₂O₄) which is 0.210 M.
2. Since oxalic acid is a diprotic acid, it has two dissociation constants, Ka1 (5.6 × 10⁻²) and Ka2 (5.1 × 10⁻⁵).
3. For the first dissociation, H₂C₂O₄ ⇌ H⁺ + HC₂O₄⁻, use the Ka1 to find the concentration of H⁺ ions.
4. Create an ICE table (Initial, Change, Equilibrium) to represent the dissociation of H₂C₂O₄.
5. Write the expression for Ka1: Ka1 = [H⁺][HC₂O₄⁻]/[H₂C₂O₄].
6. Use the quadratic formula to solve for [H⁺].
7. The resulting concentration of H⁺ (hydronium-ion) is approximately 1.06 × 10⁻² M.

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The fundamental matrix Φ(t) satisfying Φ(0) = I for the given first-order system x' = [[-1, 1], [-4, -1]]x is Φ(t) = [[e^(-t), te^(-t)], [-4te^(-t), e^(-t)]].

The fundamental matrix is a matrix whose columns are the linearly independent solutions of the given system of differential equations. In this case, we are given the matrix representation of the system and we need to find the fundamental matrix Φ(t).

To find Φ(t), we first need to find the eigenvalues and eigenvectors of the coefficient matrix A = [[-1, 1], [-4, -1]]. The eigenvalues can be found by solving the characteristic equation det(A - λI) = 0, where λ is the eigenvalue and I is the identity matrix.

Solving det(A - λI) = 0, we find that the eigenvalues are λ₁ = -2 and λ₂ = -3.

Next, we find the corresponding eigenvectors. For λ₁ = -2, we solve the equation (A - λ₁I)v₁ = 0, where v₁ is the eigenvector. Similarly, for λ₂ = -3, we solve (A - λ₂I)v₂ = 0, where v₂ is the eigenvector.

After finding the eigenvectors, we construct the fundamental matrix Φ(t) using the formula Φ(t) = [v₁ e^(λ₁t), v₂ e^(λ₂t)], where e^(λ₁t) and e^(λ₂t) are the exponential terms corresponding to the eigenvalues.

Finally, we substitute the eigenvalues and eigenvectors into the formula and simplify to obtain the fundamental matrix Φ(t) = [[e^(-t), te^(-t)], [-4te^(-t), e^(-t)]], which satisfies Φ(0) = I.

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The statement given "If a chi-square goodness of fit test ends in a significant result it means that the expected frequencies are significantly different than the observed frequencies." is true because because if a chi-square goodness of fit test ends in a significant result, it means that the expected frequencies are significantly different from the observed frequencies.

The chi-square goodness of fit test is a statistical test used to determine if observed categorical data follows an expected distribution. It compares the observed frequencies in different categories with the expected frequencies based on a specified distribution or hypothesis.

If the test yields a significant result, it indicates that there is a significant difference between the observed frequencies and the expected frequencies. In other words, the data does not fit the expected distribution, and there is evidence to suggest that the observed frequencies are not simply due to chance.

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Answer:

see answers below

Step-by-step explanation:

B = 180 -90 - 40 = 50° (angles in triangle add up to 180). so, 50 + 40 + 90 = 180.

Sine rule:   a/SIN A  =  b/SIN B  =   c/SIN C

b/sin 50 = 25/sin 40

b = (25 sin 50) / sin 40

= 29.8.

In a right-angled triangle, a ² + b ² = c ²

c ² = 25² + b²

= 1512.67

c = √1512.67

= 38.9

The derivative of f(x) is f'(x) = 8√x csc(x).

To use the second fundamental theorem of calculus to find the derivative of f(x), we first need to express f(x) as a definite integral:

f(x) = ∫x^1 8√t csc(t) dt

Using the second fundamental theorem of calculus, we can find f'(x) as follows:

f'(x) = d/dx [∫x^1 8√t csc(t) dt]

f'(x) = 8√x csc(x) - 0

f'(x) = 8√x csc(x)

Therefore, the derivative of f(x) is f'(x) = 8√x csc(x).

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