a normal population has mean 100 and variance 25.how large must the random sample be if you want the standarderror of the sample average to be 1.5?

The amount that Bella will need to contribute every year, given earnings is $7,150 .

Bella's total expenses are $40,000 per year. From the given information, we can calculate the total amount of financial aid and contribution from family as follows:

Total financial aid = $9,750 (scholarships and grants) + $3,100 (work-study) = $12,850

Total contribution from family = $20,000

To find out how much Bella needs to contribute, we can subtract the total financial aid and contribution from family from the total expenses:

Bella's contribution = Total expenses - Total financial aid - Contribution from family

= $40,000 - $12,850 - $20,000

= $7,150

Therefore, Bella needs to contribute $7,150 each year to cover her expenses.

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First part of the question is:

Bella qualifies for $9,750 in scholarships and grants per year, and she will earn $3,100 through the work-study program.

The given problem does not have a minimum value as the constraint equation and the values of x, y, z obtained from the partial derivatives of the Lagrange equation are contradictory.

Equation is a mathematical statement that expresses the equality of two expressions on either side of an equal sign. It is used to solve problems or to find unknown values. An equation is usually composed of two or more terms that are separated by an equal sign. Each side of the equation must have the same value in order for the equation to be true.

The given problem is a constrained optimization problem which can be solved using the Lagrange multiplier method. According to the Lagrange multiplier method, the objective function and the constraint equation must be combined into a single equation. Thus, the Lagrange equation for the given problem is given by:

L(x,y,z,λ) = x² + y² + z² + λ(4x² + 2y² + z² - 4)

Now, the partial derivatives of the Lagrange equation with respect to x, y and z is given by:

∂L/∂x = 2x + 8λx

∂L/∂y = 2y + 4λy

∂L/∂z = 2z + 2λz

Setting the partial derivatives of the Lagrange equation equal to zero, we get:

2x + 8λx = 0

2y + 4λy = 0

2z + 2λz = 0

Solving the above equations, we get:

x = 0

y = 0

z = 0

Substituting these values in the constraint equation, we get:

4x² + 2y²+ z² = 4

4(0)² + 2(0)²+ (0)²= 4

0 = 4

Which is a contradiction. Hence, the given problem does not have a minimum value.

In conclusion, the given problem does not have a minimum value as the constraint equation and the values of x, y, z obtained from the partial derivatives of the Lagrange equation are contradictory.

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the geometric mean of the given data is approximately 2.74.

to calculate the geometric mean of the given data, you need to multiply all the numbers together and then take the nth root, where n is the number of values. In this case, n = 12.

Geometric Mean = (3 × 2 × 1 × 2 × 1 × 5 × 9 × 1 × 2 × 3 × 3 × 10)[tex]^{1/12}[/tex]

After multiplying the numbers, we get:

Geometric Mean [tex]= (32,760)^{(1/12)}[/tex]

Now, take the 12th root:

Geometric Mean ≈ 2.74

So, the geometric mean of the given data is approximately 2.74.

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The value that represents the vertical translation from the graph of the parent function is 3.

What is translation?

A translation is a geometric transformation when each point in a figure, shape, or space is moved in a specific direction by the same amount. A translation can also be thought of as moving the origin of the coordinate system or as adding a constant vector to each point.

Here, we have

Given: function f(x) = x² , g(x)=(x+5)²+3

We have to find the value that the vertical translation from the graph of the parent function f(x) to the graph of the function g(x).

function

We apply the following function transformations:

Horizontal translations:

Suppose that h> 0

To graph y = f (x + h), move the graph of h units to the left:

For h = 5, we have:

f(x+5) = (x+5)²

Vertical translations:

Suppose that k> 0

To graph y = f (x) + k, move the graph of k units up.

For k = 3, we have:

g(x) = (x+5)²+3

Hence, The value that represents the vertical translation from the graph of the parent function is 3.

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The capacitance of the given Si n-p junction is 2.52 x 10^-16 F by using the formula for the capacitance of a pn junction under reverse bias.

To calculate the capacitance of an n-p junction with donor doping of 8×10^15 cm^−3 on the n-side, we need to use the depletion approximation and the equation for the capacitance of a pn junction under reverse bias

C = sqrt(q * ε * N_a * N_d) / V_bi * [1 + (2 * V_bi / V_r)]

where

C is the capacitance per unit area of the junction

q is the elementary charge (1.602 x 10^-19 C)

ε is the permittivity of the semiconductor material (assumed to be 11.7 * ε0 for Si)

N_a and N_d are the acceptor and donor doping concentrations, respectively

V_bi is the built-in potential of the junction

V_r is the reverse bias voltage applied to the junction.

First, we need to find the built-in potential V_bi. For an n-p junction with doping concentrations N_a and N_d, the built-in potential is given by:

V_bi = (kT/q) * ln(N_a * N_d / ni^2)

where k is the Boltzmann constant (1.38 x 10^-23 J/K), T is the temperature (assumed to be room temperature, or 300 K), and ni is the intrinsic carrier concentration of the semiconductor material (for Si at room temperature, ni = 1.45 x 10^10 cm^-3).

Plugging in the values, we get

V_bi = (1.38 x 10^-23 J/K * 300 K / 1.602 x 10^-19 C) * ln(8 x 10^15 cm^-3 * 1.45 x 10^10 cm^-3 / (1.45 x 10^10 cm^-3)^2)

= 0.721 V

Next, we can calculate the capacitance per unit area of the junction

C = sqrt(q * ε * N_a * N_d) / V_bi * [1 + (2 * V_bi / V_r)]

= sqrt(1.602 x 10^-19 C * 11.7 * ε0 * 8 x 10^15 cm^-3 * 1 cm^-3) / 0.721 V * [1 + (2 * 0.721 V / 10 V)]

= 2.52 x 10^-8 F/cm^2

Multiplying by the cross-sectional area of the junction (1 μm^2 = 10^-8 cm^2), we get the capacitance of the junction

C_total = C * A = 2.52 x 10^-8 F/cm^2 * 10^-8 cm^2 = 2.52 x 10^-16 F

So the capacitance of the n-p junction under reverse bias of 10 V is approximately 2.52 x 10^-16 F.

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--The given question is incomplete, the complete question is given

" calculate the capacitance for the following si n -p junction  with donor doping of 8×10^15 cm ^−3 on the n-side with the cross sectional area of 1μm ^2 and a reverse bias of 10V. (Note: Include the built-in potential of this junction. To calculate the contact potential, assume that the p-side Fermi level is pinned at the valence band edge and the intrinsic Fermi level is exactly at mid-gap.)"--

Answer:

k = 10

Step-by-step explanation:

given y varies inversely as x then the equation relating them is

y = [tex]\frac{k}{x}[/tex] ← k is the constant of variation

to find k use the condition that y = 5 when x = 2

5 = [tex]\frac{k}{2}[/tex] ( multiply both sides by 2 )

10 = k

The volume of the given solid is [tex]}V= \frac{32}{3} (π)[/tex]

To find the volume of the solid enclosed by the two paraboloids, we can set up a triple integral over the region of integration in xyz-space.

The paraboloids intersect where [tex]y = x^2 + z^2 = 8 -x^2 -z^2[/tex].

Solving for [tex]x^2 + z^2[/tex] we get:

[tex]x^2 + z^2 = 4[/tex]

This is the equation of a cylinder with radius 2, centered at the origin. Therefore, the region of integration is the volume enclosed between the two paraboloids within this cylinder.

To set up the triple integral, we need to choose an order of integration and determine the limits of integration for each variable.

Let's choose the order of integration as dz dy dx. Then the limits of integration are:

For z: from [tex]-\sqrt{4-x^{2} } to \sqrt{4-x^{2} }[/tex]

For y: from [tex]x^2 + z^2 to 8 - x^2 - z^2[/tex]

For x: from -2 to 2

Therefore, the triple integral to find the volume is:

integral from -2 to 2 [integral from [tex]x^2 + z^2 to 8 - x^2 - z^2[/tex] [integral from                          [tex]-\sqrt{4-x^{2} } to \sqrt{4-x^{2} }[/tex] dz] dy] dx

Evaluating this triple integral gives the volume of the solid enclosed by the two paraboloids within the cylinder to be:

[tex]V= \frac{32}{3} (π)[/tex]

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The distance between the skew lines is √[30625t² - 244000ts + 12864000].

Skew lines are two lines in space that do not intersect and are not parallel. They are not planes, as they do not lie in a single plane.

Given,

x = 3t, y = 16t, z = 2t and x = 32s, y = 614s, z = -35s

We need to find the distance between the skew lines.

To solve this problem, we will use the formula for the distance between two skew lines.

Distance between two skew lines = √[(x₁ - x₂)² + (y₁ - y₂)² + (z₁ - z₂)²]

Substituting the given values in the above formula,

Distance between two skew lines = √[(3t - 32s)² + (16t - 614s)² + (2t - (-35s))²]

= √[(3t - 32s)² + (16t - 614s)² + (2t + 35s)²]

= √[9t² - 64ts + 1024s² + 256t² - 9696st + 38416s² + 4t² + 140ts + 1225s²]

= √[1225t² - 9760ts + 51456s²]

= √[(1225 x 25)t² - 9760ts + 51456 x 25]

= √[30625t² - 244000ts + 12864000]

Therefore, the distance between the skew lines is √[30625t² - 244000ts + 12864000].

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The absolute minimum value of the function is -4390, which occurs at x = -3, and the absolute maximum value of the function is 15620, which occurs at x = 5.

To find the absolute maximum and minimum values of the function f(x)=5x^7−7x^5−5 on the interval [−3,5], we need to evaluate the function at the endpoints of the interval and at any critical points in between.

First, let's find the derivative of the function f(x):

f'(x) = 35x^6 - 35x^4

To find the critical points, we need to solve for f'(x) = 0:

35x^6 - 35x^4 = 0

35x^4(x^2 - 1) = 0

x = 0, ±1

Next, we evaluate f(x) at the endpoints and critical points:

f(-3) = -4390

f(0) = -5

f(1) = -6

f(5) = 15620

Therefore, the absolute minimum value of the function is -4390, which occurs at x = -3, and the absolute maximum value of the function is 15620, which occurs at x = 5.

In summary, the absolute minimum value of f(x) on the interval [-3,5] is -4390 and it occurs at x = -3. The absolute maximum value of f(x) on the interval [-3,5] is 15620 and it occurs at x = 5.

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Answer:

  a ≈ 6.8, B ≈ 50°, C ≈ 82°

Step-by-step explanation:

You want to solve the triangle with A=48°, b=7, c=9.

The relation given by the law of cosines is ...

  a² = b² +c² -2bc·cos(A)

  a² = 7² +9² -2·7·9·cos(48°) ≈ 45.6895

  a ≈ √45.6895 ≈ 6.76 ≈ 6.8

The law of sines can be used to find one of the other angles:

  sin(C)/c = sin(A)/a

  C = arcsin(c/a·sin(A)) ≈ arcsin(9/6.7594·sin(48°)) ≈ 81.68° ≈ 82°

The remaining angle can be found from the sum of angles in a triangle:

  B = 180° -A -C = 50°

The solution is a ≈ 6.8, B ≈ 50°, C ≈ 82°.

Answer:

  a ≈ 6.8, B ≈ 50°, C ≈ 82°

Step-by-step explanation:

You want to solve the triangle with A=48°, b=7, c=9.

The relation given by the law of cosines is ...

  a² = b² +c² -2bc·cos(A)

  a² = 7² +9² -2·7·9·cos(48°) ≈ 45.6895

  a ≈ √45.6895 ≈ 6.76 ≈ 6.8

The law of sines can be used to find one of the other angles:

  sin(C)/c = sin(A)/a

  C = arcsin(c/a·sin(A)) ≈ arcsin(9/6.7594·sin(48°)) ≈ 81.68° ≈ 82°

The remaining angle can be found from the sum of angles in a triangle:

  B = 180° -A -C = 50°

The solution is a ≈ 6.8, B ≈ 50°, C ≈ 82°.

The infinite geometric series 1 - 1/5 + 1/25 - 1/125 + ... is convergent and the sum of this infinite geometric series is 5/6.

To determine whether the infinite geometric series is convergent or divergent, and to find its sum if convergent, we'll consider the given series: 1 - 1/5 + 1/25 - 1/125 + ...

Step 1: Identify the common ratio (r).
In a geometric series, each term is a constant multiple of the previous term.

In this case, we can see that the common ratio is -1/5 because each term is obtained by multiplying the previous term by -1/5.

Step 2: Determine convergence or divergence.
An infinite geometric series converges if the absolute value of the common ratio (|r|) is less than 1, and diverges if |r| is greater than or equal to 1.

Since |-1/5| = 1/5 < 1, the series is convergent.

Step 3: Calculate the sum.
For a convergent geometric series, the sum can be found using the formula:
Sum = a / (1 - r)
where 'a' is the first term and 'r' is the common ratio.

In this case, a = 1 and r = -1/5, so:

Sum = 1 / (1 - (-1/5))
Sum = 1 / (1 + 1/5)
Sum = 1 / (6/5)
Sum = 5/6

Therefore, the sum of the infinite geometric series 1 - 1/5 + 1/25 - 1/125 + ... is 5/6.

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The maximum amount of revenue the bowling alley can generate is 1,440,000.

The revenue, R, at a bowling alley is given by the equation R = -1(x^2 - 2400x),

where x is the number of frames bowled. We want to find the maximum amount of revenue the bowling alley can

generate.

Recognize that the given equation is a quadratic function in the form of [tex]R = ax^2 + bx + c[/tex].

In this case, a = -1, b = 2400, and c = 0.

To find the maximum revenue, we need to find the vertex of the parabola represented by the quadratic function.

The x-coordinate of the vertex can be found using the formula x = -b / 2a.

Substitute the values of a and b into the formula:

x = -2400 / 2(-1) = 2400 / 2 = 1200.

Now that we have the x-coordinate of the vertex, plug it back into the equation to find the maximum revenue:

R = -1([tex]1200^2[/tex] - 2400 × 1200) = -1(-1440000) = 1,440,000.

The maximum amount of revenue the bowling alley can generate is 1,440,000.

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The t-value that would be used to construct a 95% confidence interval with a sample size of n=24 is c. 2.069.

To explain why, consider the idea of a t-distribution. We utilize the t-distribution instead of the usual normal distribution when working with small sample sizes (less than 30) and unknown population standard deviations. The t-distribution is more variable than the usual normal distribution, and this difference is compensated for by using a t-value rather than a z-value.

The t-value we select is determined by two factors: the desired level of confidence and the degrees of freedom (df) for our sample. We have 23 degrees of freedom for a 95% confidence interval with n=24 (df=n-1). We can calculate the t-value for a 95% confidence interval with 23 df using a t-table or calculator. This implies we can be 95% certain that the real population means is inside our estimated confidence zone.

It's worth noting that as the sample size grows larger, the t-distribution approaches the regular normal distribution, and the t-value approaches the z-value. So, for large sample sizes (more than 30), the ordinary normal distribution and a z-value can be used instead of the t-distribution and a t-value.

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Answer:

f(n) = 4 x 2^(n-1)

Step-by-step explanation:

The general form of a geometric sequence is given by:

an = ar^(n-1)

where a is the first term, r is the common ratio, and n is the term number.

Using the given sequence, we can find the values of a and r:

a = 4

r = 8/4 = 2

Therefore, the function that generates this sequence is:

f(n) = 4 x 2^(n-1)

For example, when n = 1, f(1) = 4 x 2^(1-1) = 4 x 1 = 4, which is the first term of the sequence. When n = 2, f(2) = 4 x 2^(2-1) = 4 x 2 = 8, which is the second term of the sequence, and so on.

Answer:

Using the given recursive formula, we can find the value of H(3) as follows:

H(3) = H(1) x H(2)

H(3) = 9 x 3

H(3) = 27

Therefore, H(3) = 27.

Step-by-step explanation:

Answer:

The sequence you provided is a recursive sequence where each term is defined using the two previous terms. Given that H(1) = 9 and H(2) = 3, we can find H(3) by multiplying H(1) and H(2): H(3) = H(1) x H(2) = 9 x 3 = 27.

Answer:

The volume of Rectangular Prism A is greater than the volume of Rectangular Prism B

Step-by-step explanation:

Volume = area x height

Rectangle A:

Area = 12 x 8

Area = 96 in^2

Volume = 96 x 20

Volume = 1920 in^3

Rectangle B:

Area = 84 in^2

Volume = 84 x 20

Volume = 1680 in^3

Answer: Volume A is bigger than B

Step-by-step explanation:

V(A)= length x width x height =(20)(12)(8)=1920

V(B)=height x base =(20)(84)=1680

So Volume A is bigger than Volume B

To solve questions involving standard normal distribution. A distribution describes how frequently each possible outcome of an event occurs in a sample or population and can be represented by a graph, a formula, or a table of values.

a. To find P(Z < -2.51 or Z > 1.76), you need to calculate the individual probabilities and then add them together.

Step 1: Find P(Z < -2.51)
Using a standard normal distribution table or calculator, look for the probability associated with Z = -2.51. You will find P(Z < -2.51) ≈ 0.0062.

Step 2: Find P(Z > 1.76)
Since the normal distribution is symmetric, P(Z > 1.76) = P(Z < -1.76). Using the standard normal distribution table, look for the probability associated with Z = -1.76. You will find P(Z < -1.76) ≈ 0.0392.

Step 3: Add the probabilities together
P(Z < -2.51 or Z > 1.76) = P(Z < -2.51) + P(Z > 1.76) ≈ 0.0062 + 0.0392 = 0.0454.

b. To find P(Z < 1.76 or Z > -2.51), note that this covers the entire range of the distribution. Thus, the probability is equal to 1.

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The total amount of money earned over 12 years would be $483,732.

Amount is a word used to describe a numerical value or quantity. It is commonly used in mathematics, finance, and economics in order to identify the size or magnitude of something. Within those contexts, it is often used to refer to the total sum of money, goods, or services that are available or being exchanged.

To calculate this, we can use the formula for compound interest:
A = [tex]P(1 + r/n)^{(nt)[/tex]
Where A is the total amount, P is the principal (initial amount), r is the interest rate (4% per year in this case), n is the number of times the interest is compounded per year (1 for annually) and t is the time (12 years in this case).
Plugging in the values, we get:
A = [tex]\$36,500 (1 + 0.04/1)^{(1\times 12)[/tex]
A = $483,732.
Therefore, the total amount of money earned over 12 years would be $483,732.

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The total amount of money earned over 12 years would be $483,732.

Amount is a word used to describe a numerical value or quantity. It is commonly used in mathematics, finance, and economics in order to identify the size or magnitude of something. Within those contexts, it is often used to refer to the total sum of money, goods, or services that are available or being exchanged.

To calculate this, we can use the formula for compound interest:
A = [tex]P(1 + r/n)^{(nt)[/tex]
Where A is the total amount, P is the principal (initial amount), r is the interest rate (4% per year in this case), n is the number of times the interest is compounded per year (1 for annually) and t is the time (12 years in this case).
Plugging in the values, we get:
A = [tex]\$36,500 (1 + 0.04/1)^{(1\times 12)[/tex]
A = $483,732.
Therefore, the total amount of money earned over 12 years would be $483,732.

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We have come to find that the probability P(x < 299) = P(z < -0.505) = 0.3061 (rounded to 4 decimal places).

In statistics, standard deviation is a measure of the amount of variability or dispersion in a set of data. It measures how spread out the data is from the mean or average value.

To calculate the standard deviation, you first find the mean of the data set, then for each data point, you subtract the mean from the data point and square the result. Next, you take the average of all the squared differences, and finally, you take the square root of that average. This gives you the standard deviation of the data set.

To find P(x < 299) for a normally distributed random variable with mean (μ) of 350 and standard deviation (σ) of 101, we need to standardize the variable and use a standard normal distribution table or calculator.

z = (x - μ) / σ # Standardizing the variable

z = (299 - 350) / 101

z = -0.505

Using a standard normal distribution table or calculator, we can find the probability that z is less than -0.505. This probability is 0.3061 (rounded to 4 decimal places).

Therefore, P(x < 299) = P(z < -0.505) = 0.3061 (rounded to 4 decimal places).

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The shortest distance between the skew lines with parametric equations is |−74s/17 + 23/17|.

To find the distance between the skew lines, we need to find the shortest distance between any two points on the two lines. Let P be a point on the first line with coordinates (1t, 36t, 2t) and let Q be a point on the second line with coordinates (12s, 414s, −35s).

Let's call the vector connecting these two points as v:

v = PQ = <1−2s, 3−10s, 2+5s>

Now we need to find a vector that is orthogonal (perpendicular) to both lines. To do this, we can take the cross product of the direction vectors of the two lines.

The direction vector of the first line is <1, 6, 0> and the direction vector of the second line is <2, 14, −5>. So,

d = <1, 6, 0> × <2, 14, −5>

d = <−84, 5, 14>

We can normalize d to get a unit vector in the direction of d:

u = d / ||d|| = <−84/85, 5/85, 14/85>

Finally, we can find the distance between the two lines by projecting v onto u:

distance = |v · u| = |(1−2s)(−84/85) + (3−10s)(5/85) + (2+5s)(14/85)|

Simplifying this expression yields:

distance = |−74s/17 + 23/17|

Therefore, the distance between the two skew lines is |−74s/17 + 23/17|. Note that the distance is not constant and depends on the parameter s.

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The two triangles that are similar are triangles A and B

Similar triangles are triangles that have the same shape, but their sizes may vary. For two triangles to be equal, the corresponding angles must be equal and the ratio of corresponding sides must be equal.

Checking the three triangles, triangle A has the angles of 125° , 25° and the third angle can be calculated as 180-(125+25) = 180-150 = 30°

Triangle B has 125°, 30° and the Third angle can be calculated as 180-(125+30) = 180-155 = 25°

Triangle C has the angle 35°,25° and the third angle can be calculated as 180-(35+25) = 180-60 = 130°

Therefore,it is shown That triangles And B are similar to each other because they have thesame corresponding angles.

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Answer:

Therefore, the integer that is congruent to 5 modulo 13 is 122.

Step-by-step explanation:

The double integral is equal to the volume of a rectangular prism which is 30.

The given double integral can be written as:

∬_R 3 dA

where R is the region in the xy-plane given by -1 ≤ x ≤ 1 and 3 ≤ y ≤ 8.

To identify this double integral as the volume of a solid, we can consider a solid with constant density 3 occupying the region R. The volume of this solid is then equal to the given double integral.

The solid in question can be visualized as a rectangular prism with a base that is a rectangle in the xy-plane and a height of 1 unit. The base of the prism corresponds to the region R in the xy-plane. The sides of the prism are perpendicular to the xy-plane and extend vertically from the base to a height of 1 unit.

Therefore, the volume of this solid is equal to the given double integral:

∬_R 3 dA

= 3 × (area of R)

= 3 × (2 × 5)

= 30.

Hence, the value of the double integral ∬_R 3 dA over the region R is equal to 30, which is the volume of the solid described above.

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the correct option is [tex]11.2 inch/sec[/tex] , as it represents the rate of change of the hypotenuse with the correct sign. Thus, option C is correct.

Let's denote the short leg by 'x' and the long leg by 'y'. The given information states that   [tex]dx/dt = -2[/tex] in/sec (since the short leg is decreasing by 2 in/sec) and dy/dt = 5 in/sec (since the long leg is growing at 5 in/sec).

We can use the Pythagorean theorem to relate the short leg, long leg, and hypotenuse of the right triangle:

[tex]x^2 + y^2 = h^2[/tex]

where 'h' represents the length of the hypotenuse.

Differentiating both sides of the equation with respect to time 't', we get:

[tex]2x(dx/dt) + 2y(dy/dt) = 2h(dh/dt)[/tex]

Substituting the given values for [tex]dx/dt, dy/dt, x,[/tex] and  [tex]y,[/tex] we have:

[tex]2(12)(-2) + 2(16)(5) = 2h(dh/dt)[/tex]

Simplifying, we get:

[tex]-48 + 160 = 2h(dh/dt)[/tex]

[tex]112 = 2h(dh/dt)[/tex]

Dividing both sides by 2h, we get:

[tex](dh/dt) = 112/(2h)[/tex]

We can now plug in the given values for x and y to find h:

[tex]x = 12 in[/tex]

[tex]y = 16 in[/tex]

Using the Pythagorean theorem, we can solve for h:

[tex]h^2 = x^2 + y^2[/tex]

[tex]h^2 = 12^2 + 16^2[/tex]

[tex]h^2 = 144 + 256[/tex]

[tex]h^2 = 400[/tex]

[tex]h = \sqrt400[/tex]

h = 20 in

Now, substituting the value of h into the equation for  [tex](dh/dt),[/tex] we get:

[tex](dh/dt) = 112/(2\times 20)[/tex]

[tex](dh/dt) = 112/40[/tex]

[tex](dh/dt) = 2.8 in/sec[/tex]

So, the rate of change of the hypotenuse is 2.8 in/sec. However, note that the question asks for the rate of change of the hypotenuse with the correct sign, indicating whether it is increasing or decreasing.

Since the long leg is growing at 5 in/sec and the short leg is decreasing at 2 in/sec.

the hypotenuse must be increasing at a rate of 2.8 in/sec (as the change in the long leg is dominating over the change in the short leg).

Therefore, the correct option is  [tex]11.2 inch/sec,[/tex] as it represents the rate of change of the hypotenuse with the correct sign.

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The values of the numerical operations obtained using the number line indicates;

1. 20 groups

2. 3 1/3

A number line consists of a line marked at (regular) intervals, which can be used for performing numerical operations.

The number line indicates that each small marking is 1/5

1. The number of groups of 1/5 in 4, can be obtained by counting the number of small markings from the start of the number line to 4 as follows;

The number of small markings between 0 and 4 = 20

Therefore, the number of groups of 1/5 that are in 4 are 20 groups

2. The value of 4 ÷ 6/5, can be obtained from the number line as follows;

The number of groups of 6/5 that are in 4, from the number line = 3 groups

The fraction of a group of 6/5 remaining when the three groups are counted before 4 is 2/5, which is (2/5)/(6/5) = 1/3

Adding the remaining fraction to the whole number value, we get the value of 4 ÷ (6/5) as follows;

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A differential equation (2xy² − 5) dx + (2x²y + 7) dy = 0  is an exact differential equation

We know that a differential equation M dx + N dy = 0 is an exact differential equation when [tex]\partial N/\partial x=\partial M/\partial y[/tex]

Consider a differential equation (2xy² − 5) dx + (2x²y + 7) dy = 0

Comparing this equation with M dx + N dy = 0 we get,

M =  (2xy² − 5)

and N = (2x²y + 7)

The partial derivative of M with respect to y is:

[tex]\frac{\partial M}{\partial y} \\\\=\frac{\partial}{\partial y}(2xy^2 -5)[/tex]

= 4xy           ...........(1)

The partial derivative of N with respect to x is:

[tex]\frac{\partial N}{\partial x} \\\\=\frac{\partial}{\partial x}(2x^2y+7)[/tex]

= 4xy          ...........(2)

From (1) and (2),

[tex]\partial N/\partial x=\partial M/\partial y[/tex]

Therefore, the differential equation is an exact differential equation

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Answer:

2 litres

Step-by-step explanation:

The capacity of a bottle of oil = 4000 ml

It is said that the bottle is half full so the half of 4000 is 2000.

Now, to convert ml to litre we need to divide 2000 by 1000

= 2000÷1000=2

Therefore, the answer is 2 litres

hope it helps! byeee