Solve the system by graphing
{y=5x-8}
{y=-3x+8

Answer:

B

Step-by-step explanation:

28/35, cos is always the adjacent side to the longest side (hypotenuse)

The scalar triple product is not zero, the three vectors (a → b), (a → c), and (a → d) are not coplanar, and hence, the four points a, b, c, and d do not lie on the same plane.

If the four points lie in the same plane, then the vector from a to b, the vector from a to c, and the vector from a to d will lie in the same plane. We can use the scalar triple product to determine if this is true.

The scalar triple product of three vectors a, b, and c is defined as:

a ⋅ (b × c)

where × represents the cross product.

So, let's compute the scalar triple product of the vectors from a to b, a to c, and a to d:

(a → b) = (5 - 2, -3 - 1, 5 - 1) = (3, -4, 4)

(a → c) = (8 - 2, -1 - 1, 0 - 1) = (6, -2, -1)

(a → d) = (5 - 2, 3 - 1, -4 - 1) = (3, 2, -5)

Now, we take the cross product of the vectors (a → b) and (a → c):

(a → b) × (a → c) =

|  i    j  k |

| 3 -4  4 |

| 6 -2 -1 |

= i (4(-2) - (-4)(-1)) - j (3(-2) - 4(-1)) + k (3(-2) - (-4)(6))

= i (-4) - j (-5) + k (-27)

= (-4, 5, -27)

Finally, we take the dot product of the resulting vector with the vector (a → d):

(-4, 5, -27) ⋅ (3, 2, -5) = -12 + 10 + 135 = 133

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To express the given statement using O-notation, we need to find the function that describes the growth of the given expression.

The given statement is:
x + 212x^5(3x + 4) ≤ 36x^5 for all real numbers x > 2

Step 1: Divide both sides of the inequality by x^5:
(x + 212x^5(3x + 4))/x^5 ≤ (36x^5)/x^5

Step 2: Simplify the inequality:
(x/x^5) + 212(3x + 4) ≤ 36
1/x^4 + 212(3x + 4) ≤ 36

Step 3: Determine the dominating term:
In this case, the term with the highest power of x is 212(3x), which grows faster than 1/x^4.

Step 4: Express the inequality using O-notation:
The given expression can be expressed as:
x + 212x^5(3x + 4) = O(x^6)

This O-notation shows that the growth rate of the expression is proportional to x^6 for all real numbers x > 2.

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To find the parametric equations for the line segment joining the first point to the second point (0,0,0) and (10,8,4), we can use the formula:

x = x1 + t(x2 - x1)
y = y1 + t(y2 - y1)
z = z1 + t(z2 - z1)
where (x1,y1,z1) is the first point and (x2,y2,z2) is the second point, and t is a parameter that varies between 0 and 1.
Substituting the values, we get:
x = 0 + t(10 - 0)
y = 0 + t(8 - 0)
z = 0 + t(4 - 0)
Simplifying, we get:
x = 10t
y = 8t
z = 4t
Therefore, the parametric equations for the line segment joining the first point to the second point are x = 10t, y = 8t, and z = 4t.

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A. The initial concentration of the drug in the organ is 0.06 mg/cm³.
B. the concentration of the drug in the organ after 19 seconds is approximately 0.1043 mg/cm³.

(a) The initial concentration of the drug in the organ can be found by evaluating x(t) at time t=0.

x(0) = 0.06 + 0.14(1 − e^(-0.02*0))
x(0) = 0.06 + 0.14(1 − 1)
x(0) = 0.06 + 0.14(0)
x(0) = 0.06

The initial concentration of the drug in the organ is 0.06 mg/cm³.

(b) To find the concentration of the drug in the organ after 19 seconds, plug t=19 into the given equation:

x(19) = 0.06 + 0.14(1 − e^(-0.02*19))
x(19) = 0.06 + 0.14(1 − e^(-0.38))
x(19) ≈ 0.06 + 0.14(1 − 0.6835)
x(19) ≈ 0.06 + 0.14(0.3165)
x(19) ≈ 0.10431

After rounding to four decimal places, the concentration of the drug in the organ after 19 seconds is approximately 0.1043 mg/cm³.

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Based on the given information, the best statement is: A. c1u + c2u = (c1 + c2)u

This statement illustrates the distributive property of scalar multiplication over vector addition. In this case, u is a vector, while c1 and c2 are scalars. When you factor out the vector u, you are left with the sum of the scalars (c1 + c2) multiplied by the vector u.

Distributive property: According to this property, multiplying the sum of two or more addends by a number will give the same result as multiplying each addend individually by the number and then adding the products together.

A scalar quantity is different from a vector quantity in terms of direction. Scalars don’t have direction, whereas a vector has. Due to this feature, the scalar quantity can be said to be represented in one dimension, whereas a vector quantity can be multi-dimensional.

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The shapes involved in the first figure is a triangle and a trapezium, with an area of 139.5. The shapes involved in the second figure is a triangle and a rectangle, with an area of 22 square units.

The first figure can be observed to be made up of a triangle and a trapezium. While the second is a triangle and a rectangle, so we shall calculate for the area and sum the results to get the total area of the composite figures as follows:

First figure:

area of the triangle = 1/2 × 9 × 6 = 27 square units

area of the trapezium = 1/2 × (6 + 9) × 15 = 112.5 square units

area of the first figure = 27 + 112.5 = 139.5 square units

Second figure:

area of the triangle = 1/2 × 4 × 2 = 4 square units

area of the rectangle = 9 × 2 = 18 square

area of the second figure = 4 + 18 = 22 square units.

Therefore, the shapes involved in the first figure is a triangle and a trapezium, with an area of 139.5. The shapes involved in the second figure is a triangle and a rectangle, with an area of 22 square units.

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The area of shaded polygons in RSM with 5 and 7 measurements having a blue form have a surface area of 0 square units.

In RSM, the area of the shaded polygons can be calculated.

They have provided 5 and 7 measurements in this instance, which we can use to determine how long the sides of the blue object should be.

The rectangle measures 7 units long by 5 units wide.

The bases of the two right triangles are 5 units and their heights are 2 units.

We apply the algorithm to determine the rectangle's area.

A = l x w,

Where,

A is denoted as the area,

l is  denoted as  the length and

w is denoted as the width.

A = 7 x 5 = 35 square units.
The shaded polygons' areas should be added.

The combined area of the shaded polygons in the RSM is calculated by adding the areas of each polygon.

Total Area = A1 + A2 and so on.

The area of one of the right angle triangles, we use the formula,

A = [tex]\frac{1}{2}[/tex] x b x h, [tex]\frac{1}{2}[/tex]

Where,

A is denoted as the area,

b is denoted as the base and

h is  denoted as the height.

Plugging in the values we get

A =  x 5 x 2 = [tex]5^{2}[/tex] units.

Since there are two right triangles the total area is

2 x 5 = 10 square units.
Therefore,

The area of the blue shape is

35 + 10 = 45 square units.

The rectangle's area and the areas of the two right triangles are,

35 + 10 = [tex]54^{2}[/tex] units.

Consequently, the shaded polygons' area is

45 - 45 = 0 square units.
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The correct answer to the above question is Option C. divergent i.e., The series [infinity] ∑ sin(n) + 3^n is divergent.

To determine the convergence of the series, we need to check both the convergence of sin(n) and 3^n series.

Since both series diverge, their sum will also diverge, and the given series is therefore divergent.

In summary, the given series [infinity] ∑ sin(n) + 3^n is divergent as both the sin(n) and 3^n series diverge.

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The volume of the composite figure is 129.85 cm³.

The volume of the composite figure is made up of volume of cylinder plus volume of cone.

height of the cylinder = 8 cm

height of the cone = 15 cm - 8 cm = 7 cm

Volume of the cylinder is calculated as follows;

V = πr²h

V = π (2 cm)² (8 cm )

V = 100.53 cm³

The volume of the cone is calculated as follows;

V = ¹/₃πr²h

V = ¹/₃π(2 cm)²(7 cm)

V = 29.32 cm³

Total volume = 100.53 cm³ + 29.32 cm³ = 129.85 cm³

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(a) The 90% confidence interval for p. ≤ p ≤ is 0.6256 ≤ p ≤ 0.7230. (b) The margin of error for this 90% confidence interval for p is 0.0487. (c) The margin of error is smaller for an 80% confidence interval. So, the correct option is option   B. smaller.

(a) Calculate the sample proportion (p-hat) and the standard error (SE).

p-hat = 354 / 525 ≈ 0.6743 (rounded to four decimal places)
SE = √(p-hat * (1 - p-hat) / n) ≈ √(0.6743 * (1 - 0.6743) / 525) ≈ 0.0296 (rounded to four decimal places)

The z-score for a 90% confidence interval is 1.645.

Now, we can calculate the confidence interval using the formula:
CI = p-hat ± (z-score * SE)

CI = 0.6743 ± (1.645 * 0.0296)
CI = 0.6743 ± 0.0487

Thus, the 90% confidence interval for p is: 0.6256 ≤ p ≤ 0.7230

(b) To find the margin of error for this 90% confidence interval for p, we simply take the difference between the upper limit and the sample proportion:

Margin of error = 0.7230 - 0.6743 = 0.0487

(c) Without doing any calculations, the margin of error for an 80% confidence interval would be smaller because the level of confidence is lower, which means that we are willing to accept a wider range of possible values for the population proportion. As a result, the margin of error will be smaller for an 80% confidence interval compared to a 90% confidence interval.

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(a) The 90% confidence interval for p. ≤ p ≤ is 0.6256 ≤ p ≤ 0.7230. (b) The margin of error for this 90% confidence interval for p is 0.0487. (c) The margin of error is smaller for an 80% confidence interval. So, the correct option is option   B. smaller.

(a) Calculate the sample proportion (p-hat) and the standard error (SE).

p-hat = 354 / 525 ≈ 0.6743 (rounded to four decimal places)
SE = √(p-hat * (1 - p-hat) / n) ≈ √(0.6743 * (1 - 0.6743) / 525) ≈ 0.0296 (rounded to four decimal places)

The z-score for a 90% confidence interval is 1.645.

Now, we can calculate the confidence interval using the formula:
CI = p-hat ± (z-score * SE)

CI = 0.6743 ± (1.645 * 0.0296)
CI = 0.6743 ± 0.0487

Thus, the 90% confidence interval for p is: 0.6256 ≤ p ≤ 0.7230

(b) To find the margin of error for this 90% confidence interval for p, we simply take the difference between the upper limit and the sample proportion:

Margin of error = 0.7230 - 0.6743 = 0.0487

(c) Without doing any calculations, the margin of error for an 80% confidence interval would be smaller because the level of confidence is lower, which means that we are willing to accept a wider range of possible values for the population proportion. As a result, the margin of error will be smaller for an 80% confidence interval compared to a 90% confidence interval.

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The mean (expected value) of the random variable x associated with the probability density function f(x) = (1/72)x^2 over the interval [0, 6] is 4.5.

To find the mean (expected value) of the random variable x associated with the probability density function f(x) = 1/72 x^2 over the interval [0, 6], we use the formula:

E(x) = ∫[0,6] x f(x) dx

= ∫[0,6] x (1/72 x^2) dx

= (1/72) ∫[0,6] x^3 dx

= (1/72) [(1/4) x^4] [0,6]

= (1/72) [(1/4) (6^4 - 0^4)]

= (1/72) (6^4/4)

= (1/72) (324)

= 4.5

To find the mean (expected value) of the random variable x associated with the probability density function f(x) = (1/72)x^2 over the interval [0, 6], we need to integrate the product of x and the probability density function over the given interval.

Mean (expected value) = E(x) = ∫(x * f(x)) dx, over the interval [0, 6]

E(x) = ∫(x * (1/72)x^2) dx from 0 to 6
E(x) = (1/72) * ∫(x^3) dx from 0 to 6

Now, integrate x^3 with respect to x:

E(x) = (1/72) * (x^4 / 4) | from 0 to 6

Now, evaluate the integral at the limits:

E(x) = (1/72) * ((6^4 / 4) - (0^4 / 4))
E(x) = (1/72) * (1296 / 4)
E(x) = (1/72) * 324

Finally, multiply the result:

E(x) = 4.5

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The first derivative of the function g(x) is:

g'(x) = 2cos(x)*[cos(x) - sin(x)] / sin(x)^2

We can find the first derivative of the function g(x) using the quotient rule and the chain rule of differentiation:

g(x) = sin(2x) / tan(x)

g'(x) = [cos(x)*tan(x)2cos(2x) - sin(2x)(sec(x))^2] / (tan(x))^2

We can simplify this expression by using trigonometric identities:

g'(x) = [2cos(x)*cos(2x) - sin(2x)*cos(x)^2] / sin(x)^2

g'(x) = [cos(x)*(2cos(2x) - sin(2x)*cos(x))] / sin(x)^2

g'(x) = 2cos(x)*[cos(x) - sin(x)] / sin(x)^2

Therefore, the first derivative of the function g(x) is:

g'(x) = 2cos(x)*[cos(x) - sin(x)] / sin(x)^2

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Answer: 12x^3+21x^

Step-by-step explanation:

you need to multiply the expression outside to every term inside the parentheses . Multiply the numbers and add the powers. Good luck with algebra

the derivative of the function, then evaluate it at x=1 and finally multiply it by δx.

δy = -0.04 and f'(x)δx = -0.04.

An example of a differentiable function is f, and its derivative is f ′. If f has a derivative, it is denoted by the symbol f ′ and is known as f's second derivative. Similar to the second derivative, the third derivative of f is the derivative of the second derivative, if it exists. By carrying on with this method, the nth derivative can be defined, if it exists, as the derivative of the (n1)th derivative.

To find δy and f'(x)δx for the function y=f(x)=x−x^3 with x=1 and δx=0.02, we'll first find the derivative of the function, then evaluate it at x=1, and finally multiply it by δx.

1. The derivative of f(x)=x−x³ is f'(x)=1-3x²
2. Evaluating f'(x) at x=1, we get f'(1)=1-3(1)²=1-3=-2.
3. Now, we'll multiply f'(x) by δx: f'(1)δx = (-2)(0.02)=-0.04.

So, δy = -0.04 and f'(x)δx = -0.04.

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(b) The signal [tex]x_2(t)[/tex]  is not periodic because its exponential term does not repeat after a certain interval.  (c) The signal [tex]x_3[n][/tex] is periodic because it is a discrete-time complex exponential signal with frequency 7π.

What is periodic ?

In signal processing, a periodic signal is a signal that repeats itself after a specific interval of time known as the period.

The signal [tex]x_2(t)[/tex] is not periodic because its exponential term does not repeat after a certain interval. Therefore, it does not have a fundamental period. On the other hand, [tex]x_3[n][/tex] is a discrete-time complex exponential signal with frequency 7π. A signal is periodic if and only if it satisfies the condition x[n] = x[n+N] for all n, where N is the fundamental period. Using the definition of [tex]x_3[n][/tex] , we can write:

[tex]x_3[n] = e^{j7\pi n} = e^{j7\pi (n+N)}[/tex]

If we equate the two sides of the equation, we get:

[tex]e^{j7\pi n} = e^{j7\pi n} * e^{j7\pi N}[/tex]

Simplifying the above expression, we get:

[tex]e^{j7\pi N} = 1[/tex]

The solution of this equation is N = 2/7 because

[tex]e^{j7\pi N} = cos(2\pi N) + j sin(2\pi N) = 1[/tex]                      

Therefore, the fundamental period of [tex]x_3[n][/tex] is N = 2/7. In summary, [tex]x_2(t)[/tex] is not periodic and [tex]x_3[n][/tex] is periodic with a fundamental period of 2/7.

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The complete question is :

Determine whether or not each of the following signals is periodic. If a signal is periodic, specify its fundamental period.

(b) [tex]x_2(t)=e^{(-1+j)t[/tex]

(c) [tex]x_3[n]=e^{j7\pi n[/tex]

The minimum value of the function f(x) = 3x on the interval [3, 6] is 9, and the maximum value of this function is 18.

We have to find the maximum and minimum values of f(x) = 3x on the interval [3, 6].

First, determine the critical points.
To find the critical points, we first find the derivative of the given function:

f'(x) = 3, which is a constant value.

Since there are no points where f'(x) = 0 or is undefined, there are no critical points within the function itself.

Now, evaluate the function at the endpoints of the interval.
Since there are no critical points, we will evaluate the function at the endpoints of the interval [3, 6] to find the maximum and minimum values.

f(3) = 3 * 3 = 9
f(6) = 3 * 6 = 18

Now, determine the maximum and minimum values.
Since 9 is the lowest value and 18 is the highest value, the minimum value of f(x) = 3x on the interval [3, 6] is 9, and the maximum value is 18.

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Check the picture below.

[tex]\cfrac{1^2}{2^2}=\cfrac{110}{A}\implies \cfrac{1}{4}=\cfrac{110}{A}\implies A=440~in^2[/tex]

According to this range , The right response is hence A.

Range in mathematics is a statistical indicator of dispersion, or how widely spaced a given data collection is from smallest to largest. The range of a piece of data is the distinction between the largest and lowest value.

The range of the data is 9, and it is almost symmetric. This could occur because the bookstore offers a discount on all books costing more than $6.

Data that is symmetrical is uniformly distributed around the mean. In other words, the distribution's left side is the right side's mirror image. We can infer that the mean is roughly in the middle of the price range in this situation because the data is almost symmetric.

The difference between the largest and smallest numbers in a piece of data is known as the range of the data.

The range in this instance is 9, as there are nine dollars between the highest price ($9) and the lowest price ($0).

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The series Diverges; the limit of the terms, an, is not 0 as n goes to infinity.(C)

The given series is not a geometric series, but let's first simplify it to better understand its behavior. The simplified series is: 2n + 14 = 1. This is an arithmetic series, not a geometric one. Therefore, the correct answer is:


To determine whether the series is convergent or divergent, we can try to find the limit of the terms as n goes to infinity.

In this case, the simplified series is 2n + 14 = 1, which can be rewritten as 2n = -13. As n goes to infinity, the term 2n will also go to infinity. Therefore, the limit of the terms, an, is not 0 as n goes to infinity, and the series diverges.(C)

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Average rate of change gives us the slope of the secant line that connects the two points on the graph of g(t) corresponding to t = a and t = b. This can help us understand how quickly the function is changing over the interval and can be useful in many applications.

We need to use the formula:

average rate of change = (g(b) - g(a))/(b - a)

Here, g(b) represents the value of the function at t = b and g(a) represents the value of the function at t = a.

We can use this formula to calculate the average rate of change of g(t) over the given interval. Just substitute the values of g(a), g(b), a, and b into the formula and simplify the expression to get the answer.

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At a 99% level of confidence, the margin of error is approximately 23.1923 minutes (rounded to 4 decimal places).

To calculate the margin of error, we will use the formula:

Margin of Error = Z × (Standard Deviation / √Sample Size)

In this case, we have a 99% level of confidence, which corresponds to a Z-score of 2.576. The standard deviation is 59 minutes, and the sample size is 43.

Margin of Error = 2.576 × (59 / √43)

Now, calculate the margin of error:

Margin of Error = 2.576 × (59 / 6.5574)
Margin of Error = 2.576 × 9.0034
Margin of Error = 23.1923

So, at a 99% level of confidence, the margin of error is approximately 23.1923 minutes (rounded to 4 decimal places).

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The solution to the differential equation that satisfies the initial conditions y(3) = y0 and y(8) = y1 is:

y(t) = (2/3)t - (1/3)cos(t) + (1/3)sin(t) + y1 + (1/3)sin(3) - (2

The given differential equation is:

3y''+2y'y-y-tan(t)=0

To check the existence and uniqueness of a solution, we need to verify if the function p(t) and q(t) satisfy the conditions of the Existence and Uniqueness Theorem.

The Existence and Uniqueness Theorem states that if the functions p(t) and q(t) are continuous on an interval containing a point t0 and if p(t) is not equal to zero at t0, then there exists a unique solution to the differential equation y'' + p(t) y' + q(t) y = g(t) that satisfies the initial conditions y(t0) = y0 and y'(t0) = y1.

Comparing the given differential equation with the standard form of the Existence and Uniqueness Theorem, we get:

p(t) = 2y(t)

q(t) = -t - tan(t)

g(t) = 0

To find the interval of existence, we need to check the continuity of p(t) and q(t) and also the value of p(t) at t0.

Here, p(t) is continuous everywhere and q(t) is continuous on the interval (3, 8). To check the value of p(t) at t0, we need to find y(t) that satisfies the initial conditions y(3) = y0 and y(8) = y1.

Let's assume that y(t) = A(t) + B(t), where A(t) satisfies y(3) = y0 and A'(3) = 0 and B(t) satisfies y(8) = y1 and B'(8) = 0.

Solving the differential equation for A(t), we get:

A(t) = c1 cos(sqrt(3)(t-3)) + c2 sin(sqrt(3)(t-3)) + (2/3)t - (1/3)cos(t) + (1/3)sin(t) + (1/3)sin(3)

Using the initial conditions y(3) = y0 and A'(3) = 0, we get:

A(t) = (2/3)t - (1/3)cos(t) + (1/3)sin(t) + (1/3)sin(3) - (2/3)cos(3) - y0

Solving the differential equation for B(t), we get:

B(t) = c3 cos(sqrt(3)(t-8)) + c4 sin(sqrt(3)(t-8)) + (2/3)t - (1/3)cos(t) + (1/3)sin(t) - (1/3)sin(3)

Using the initial conditions y(8) = y1 and B'(8) = 0, we get:

B(t) = (2/3)t - (1/3)cos(t) + (1/3)sin(t) - (1/3)sin(3) + (2/3)cos(3) + y1

Therefore, the solution to the differential equation that satisfies the initial conditions y(3) = y0 and y(8) = y1 is:

y(t) = (2/3)t - (1/3)cos(t) + (1/3)sin(t) + y1 + (1/3)sin(3) - (2)

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The derivative of y with respect to x, or dy/dx, is [tex]-2xy - 7/2 y^2.[/tex]

To use implicit differentiation to find dy/dx, we'll take the derivative of both sides of the equation with respect to x, using the chain rule for the left-hand side:

[tex](7xy+4)^2 = 28y[/tex]

2(7xy+4)(7y dx/dx + 7x dy/dx) = 28 dy/dx

Simplifying and solving for dy/dx, we get:

(7xy+4)(14y + 14x dy/dx) = 28 dy/dx

[tex]98xy^2 + 56xy + 56x dy/dx = 28 dy/dx[/tex]

[tex]98xy^2 + 28 dy/dx = -56xy[/tex]

[tex]dy/dx = (-56xy - 98xy^2) / 28[/tex]

Simplifying further, we get:

[tex]dy/dx = -2xy - 7/2 y^2[/tex]

Therefore, the derivative of y with respect to x, or dy/dx, is [tex]-2xy - 7/2 y^2.[/tex]

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The derivative of y with respect to x, or dy/dx, is [tex]-2xy - 7/2 y^2.[/tex]

To use implicit differentiation to find dy/dx, we'll take the derivative of both sides of the equation with respect to x, using the chain rule for the left-hand side:

[tex](7xy+4)^2 = 28y[/tex]

2(7xy+4)(7y dx/dx + 7x dy/dx) = 28 dy/dx

Simplifying and solving for dy/dx, we get:

(7xy+4)(14y + 14x dy/dx) = 28 dy/dx

[tex]98xy^2 + 56xy + 56x dy/dx = 28 dy/dx[/tex]

[tex]98xy^2 + 28 dy/dx = -56xy[/tex]

[tex]dy/dx = (-56xy - 98xy^2) / 28[/tex]

Simplifying further, we get:

[tex]dy/dx = -2xy - 7/2 y^2[/tex]

Therefore, the derivative of y with respect to x, or dy/dx, is [tex]-2xy - 7/2 y^2.[/tex]

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The following parts can be answered by the concept of Differential equation.

(a) For the differential equation 4x²y'' + 4xy' - (64x² - 9)y = 0, we can rewrite it as:

y'' + (1/x)y' - (16 - 9/x²)y = 0

This is a Bessel's equation of order ν = 3. The general solution is given by:

y(x) = c_1 J_3(2√2x) + c_2 Y_3(2√2x)

where c_1 and c_2 are constants, J_3 is the Bessel function of the first kind of order 3, and Y_3 is the Bessel function of the second kind of order 3.

(b) For the differential equation x²y'' + xy' - (36x² - 9)y = 0, we can rewrite it as:

y'' + (1/x)y' - (36 - 9/x²)y = 0

This is also a Bessel's equation, but with order ν = 3/2. The general solution is given by:

y(x) = c_1 J_(3/2)(6x) + c_2 Y_(3/2)(6x)

where c_1 and c_2 are constants, J_(3/2) is the Bessel function of the first kind of order 3/2, and Y_(3/2) is the Bessel function of the second kind of order 3/2.

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The equations that have no solution are the third and fourth equations.

The equations that have one solution are the first, second and fifth equations.

There are three main methods of solving simultaneous equations as:

Elimination method

Graphical Method

Substitution method

The first two simultaneous equations clearly have one solution each because it is clear that when we subtract both, we can eliminate y and solve for x.

However, the third and fourth equations have no solution as the variables attached to both x and y in both cases are the same.

The fifth simultaneous equation has one solution because at least one of them with variable is different.

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The factored form of polynomial P(x) is [tex]P(x) = 1(x + 2)(x^2 - x + 9).[/tex]

To factor [tex]P(x) = x^3 + 2x^2 + 9x + 18,[/tex]we need to first look for any common factors that we can factor out. In this case, we can factor out a 1, so:

[tex]P(x) = 1(x^3 + 2x^2 + 9x + 18)[/tex]

Next, we can try to find the roots of the polynomial by using the Rational Root Theorem, which states that if a polynomial has integer coefficients, then any rational root of the polynomial must have the form p/q, where p is a factor of the constant term and q is a factor of the leading coefficient. In this case, the constant term is 18 and the leading coefficient is 1, so the possible rational roots are:

±1, ±2, ±3, ±6, ±9, ±18

We can try these roots by using synthetic division or long division to see if they are roots of the polynomial. After trying a few of these roots, we find that -2 is a root of the polynomial, so we can factor out (x + 2):

[tex]P(x) = 1(x^3 + 2x^2 + 9x + 18)\\     = 1(x + 2)(x^2 + ax + b)[/tex]

where a and b are coefficients that we need to find. To find a and b, we can use the fact that the coefficient of x^2 in the factored form should be equal to the coefficient of x^2 in the original polynomial. That is,

2 + 2a = 2

Solving for a, we get a = -1. Next, we can expand the factor (x^2 - x + b) and equate the coefficients of x and the constant term to the corresponding coefficients in the original polynomial. That is,

2a + b = 9
2b = 18

Solving for b, we get b = 9. Therefore, we have:

[tex]P(x) = 1(x + 2)(x^2 - x + 9)[/tex]

So the factored form of P(x) is [tex]P(x) = 1(x + 2)(x^2 - x + 9).[/tex]

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The factored form of polynomial P(x) is [tex]P(x) = 1(x + 2)(x^2 - x + 9).[/tex]

To factor [tex]P(x) = x^3 + 2x^2 + 9x + 18,[/tex]we need to first look for any common factors that we can factor out. In this case, we can factor out a 1, so:

[tex]P(x) = 1(x^3 + 2x^2 + 9x + 18)[/tex]

Next, we can try to find the roots of the polynomial by using the Rational Root Theorem, which states that if a polynomial has integer coefficients, then any rational root of the polynomial must have the form p/q, where p is a factor of the constant term and q is a factor of the leading coefficient. In this case, the constant term is 18 and the leading coefficient is 1, so the possible rational roots are:

±1, ±2, ±3, ±6, ±9, ±18

We can try these roots by using synthetic division or long division to see if they are roots of the polynomial. After trying a few of these roots, we find that -2 is a root of the polynomial, so we can factor out (x + 2):

[tex]P(x) = 1(x^3 + 2x^2 + 9x + 18)\\     = 1(x + 2)(x^2 + ax + b)[/tex]

where a and b are coefficients that we need to find. To find a and b, we can use the fact that the coefficient of x^2 in the factored form should be equal to the coefficient of x^2 in the original polynomial. That is,

2 + 2a = 2

Solving for a, we get a = -1. Next, we can expand the factor (x^2 - x + b) and equate the coefficients of x and the constant term to the corresponding coefficients in the original polynomial. That is,

2a + b = 9
2b = 18

Solving for b, we get b = 9. Therefore, we have:

[tex]P(x) = 1(x + 2)(x^2 - x + 9)[/tex]

So the factored form of P(x) is [tex]P(x) = 1(x + 2)(x^2 - x + 9).[/tex]

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The measure of angle ABD is given as follows:

m < ABD = 172º.

The angle addition postulate states that if two angles share a common vertex and a common angle, forming a combination, the measure of the larger angle will be given by the sum of the smaller angles.

In the context of this problem, we have that angle ABD is formed as a combination of angles ABC and CBD, hence:

m < ABD = m < ABC + m < DBC

m < ABD = 147 + 25

m < ABD = 172º.

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School districts preferred hiring unmarried women as teachers in the late nineteenth and early part of the twentieth century due to societal beliefs that married women were expected to prioritize their roles as wives and mothers, leaving little time or energy for teaching responsibilities.

During the late nineteenth and early twentieth centuries, societal beliefs placed a strong emphasis on women's domestic roles as wives and mothers. This resulted in a bias against hiring married women as teachers, as it was assumed that they would prioritize their family responsibilities over their teaching duties.

In contrast, unmarried women were seen as more dedicated and committed to their profession, as they were not expected to balance their professional and domestic responsibilities.

Furthermore, teaching was considered an appropriate profession for unmarried women, as it was viewed as an extension of their nurturing and caretaking roles within the family. This stereotype was reinforced by the fact that many female teachers were required to remain single in order to keep their teaching positions.

Overall, the preference for hiring unmarried women as teachers was a reflection of societal beliefs about gender roles and expectations during this time period.

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At the given rate, the athlete could run 10.584 miles in 1.5 hours.

To determine how many miles the athlete could run in 1.5 hours at the given rate, follow these steps:

Step 1: Calculate the athlete's speed in miles per minute.

The athlete can run 6 miles in 51 minutes, so their speed is:

Speed = Distance ÷ Time = 6 miles ÷ 51 minutes ≈ 0.1176 miles per minute.

Step 2: Convert 1.5 hours to minutes.

1.5 hours = 1.5 × 60 = 90 minutes.

Step 3: Calculate the distance the athlete can run in 1.5 hours.

Distance = Speed × Time = 0.1176 miles per minute × 90 minutes ≈ 10.584 miles.

Therefore, at the given rate, the athlete could run approximately 10.584 miles in 1.5 hours.

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