transversal problems pls hlp

The minimum height the mirror must have for you to be able to see the top of the table in the mirror is 1.4 m.

This is because the angle of incidence (the angle between the incident ray and the normal to the mirror) is equal to the angle of reflection (the angle between the reflected ray and the normal to the mirror).

In order for you to see the top of the table in the mirror, the reflected ray from the top of the table must reach your eyes.

This means that the incident ray from your eyes must hit the mirror at an angle that allows it to reflect up to the top of the table and then back to your eyes.

The minimum height of the mirror required for this to happen is equal to the height of the table (0.90 m) plus your eye level (1.9 m) plus the distance from the mirror to your eyes (2.4 m), which equals 5.2 m.

Therefore, the minimum height the mirror must have is 1.4 m.

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The equation of line b is y = -3x.

An equation is a mathematical statement that expresses the equality of two expressions. It is a representation of a relationship between two or more variables, and it can be written using symbols, numbers, and/or words. Equations are used to describe physical and chemical processes, to calculate unknown values, and to solve problems. Equations are fundamental to all areas of mathematics, science, engineering, and technology.

The equation of line b can be determined by finding the negative reciprocal of the slope of line a. The equation of line a is y = 1/3x + 3, which has a slope of 1/3.

Therefore, the slope of line b is the negative reciprocal of 1/3, which is -3. The equation of line b can be determined by using the slope-intercept form, y = mx + b. Substituting m = -3 and b = 0, the equation of line b is y = -3x + 0. Therefore, the equation of line b is y = -3x.

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Answer: 157 in2

Step-by-step explanation:

The formula for the surface area of a cylinder is given by 2πr(r+h), where r is the radius of the base and h is the height of the cylinder. From the given net of the cylinder, we can see that the radius of the base is 5 inches and the height of the cylinder is 4 inches.

Substituting these values into the formula, we get:

Surface area = 2 x 3.14 x 5 x (5 + 4)

Surface area = 157 in2

Therefore, the surface area of the cylinder is 157 in2.

a. The  (g o f)(x) of the given function is -10 + 50x.

b. The domain of (g o f)(x) is the set of all real numbers (-infinity, infinity).

a. To find (g o f)(x), we need to first evaluate g(f(x)) by plugging f(x) into g(x).

g(f(x)) = g(2-10x) = -5(2-10x) = -10 + 50x

Therefore, (g o f)(x) = -10 + 50x.

b. The domain of (g o f)(x) is the set of all values of x for which the function is defined. Since the composition of two functions is defined only when the range of the inner function (f(x) in this case) is contained in the domain of the outer function (g(x) in this case), we need to find the values of x that satisfy this condition.

The range of f(x) is the set of all real numbers, since f(x) is a linear function.

The domain of g(x) is also the set of all real numbers.

In interval notation, the domain is (-infinity, infinity).

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The expression "a = 4 or b > 2" is true when a = 2 and b = 4 because the second part of the expression, "b > 2", is true.

The given expression is "a = 4 or b > 2" where a = 2 and b = 4.

The first part of the expression is "a = 4", which is false because a is not equal to 4.

The second part of the expression is "b > 2", which is true because b is equal to 4, which is greater than 2.

Since the expression is an "or" statement, only one part of it needs to be true for the entire expression to be true. Therefore, the result of the expression is true.

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After observing the graphs generated by these simulations, you can draw the following conclusions:
1. As the sample size increases, the distribution of the sample mean becomes narrower, indicating that the sample mean estimates the true population mean more accurately.
2. Larger sample sizes result in lower variability of the sample mean, which means that it is less likely for extreme values to occur in larger samples.
3. The Central Limit Theorem holds true, which states that the distribution of the sample mean approaches a normal distribution as the sample size increases, regardless of the shape of the population distribution.

In the given problem, you are asked to simulate the sample mean of different sample sizes (100, 400, and 625) using the `simulate_sample_mean` function with 10,000 repetitions. Let me help you with the step-by-step explanation:

1. First, you simulated the sample mean for a sample size of 100 salaries:

```
simulate_sample_mean(salaries, 'salary', 100, 10000)
plots.xlim(50000, 100000)
```

2. Next, you need to do the same for sample sizes of 400 and 625 salaries. To do this, you will use the same `simulate_sample_mean` function but change the sample size parameter:

For sample size 400:

```
simulate_sample_mean(salaries, 'salary', 400, 10000)
plots.xlim(50000, 100000)
```

For sample size 625:

```
simulate_sample_mean(salaries, 'salary', 625, 10000)
plots.xlim(50000, 100000)

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The exact length of the curve is approximately 0.224 units.

To find the length of the curve, we need to use the arc length formula:

[tex]L = \int_a^b \sqrt{1+\dfrac{dy}{dx}^2} dx[/tex]

Here, we have parametric equations x = 6 12t2, y = 9 8t3, 0 ≤ t ≤ 4. So, we need to find dy/dx and then substitute it in the arc length formula.

dy/dx = (dy/dt)/(dx/dt)

= (24t^2)/(36t^4)

= 2/(3t^2)

Now, we substitute this value in the arc length formula:

[tex]L =\int_0^4 \sqrt{1+\dfrac{2}{(3t^2)}^2 dt[/tex]

[tex]L = \int_0^4 \sqrt{1+\dfrac{4}{9t^4}} dt[/tex]

Let u = 1+4/(9t4). Then du/dt = -(16/(27t5))

Hence, dt = -(27t5)/16 du

When t = 0, u = 1+4/(90^4) = 1

When t = 4, u = 1+4/(94^4) = 1.00185 (approx)

So, the integral becomes:

L = [tex]\int_1^{1.00185}\sqrt{u} \times \dfrac{-(27t^5)}{16} du[/tex]

L ≈ 0.224

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It is not divisible by 3. However, we know that 0k+1 22(k+1) – 1 must be divisible by 3 for all integers k. This is a contradiction, so our assumption must be false. Therefore, we have proven that for all integers n, 0n 22n – 1 is divisible by 3.

To prove that for all integers n, 0n 22n – 1 is divisible by 3, we will use mathematical induction.

First, let's check the base case. When n = 0, we have 0220 – 1 = 0, which is divisible by 3.

Next, let's assume that for some arbitrary integer k, 0k 22k – 1 is divisible by 3. This is our induction hypothesis.

Now, we want to prove that this is also true for k + 1. We have: 0k+1 22(k+1) – 1 = (2 × 0k 22k) + (0 × 22) – 1 = 2(0k 22k – 1) + 1

From our induction hypothesis, we know that 0k 22k – 1 is divisible by 3.

Therefore, we can write: 0k 22k – 1 = 3m where m is some integer.

Substituting this into our equation above, we get: 2(3m) + 1 = 6m + 1

Now, we can see that 6m is divisible by 3, so 6m + 1 is one more than a multiple of 3.

Therefore, it is not divisible by 3. However, we know that 0k+1 22(k+1) – 1 must be divisible by 3 for all integers k. This is a contradiction, so our assumption must be false. Therefore, we have proven that for all integers n, 0n 22n – 1 is divisible by 3.

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The series is given by ∑(14n(n+1)42^n) from n=1 to infinity is divergent.

The ratio test is a method used to determine whether an infinite series is convergent or divergent. To use the ratio test for determining the convergence or divergence of the given series, follow these steps:

1. Identify the general term: Here, the series is given by ∑(14n(n+1)42^n) from n=1 to infinity.

2. Calculate the ratio of consecutive terms: Find the limit as n approaches infinity of the absolute value of the ratio a_(n+1)/a_n, where a_n is the general term of the series.

  a_(n+1) = 14(n+1)((n+1)+1)42^(n+1)
  a_n = 14n(n+1)42^n

  a_(n+1)/a_n = [(14(n+1)((n+1)+1)42^(n+1)] / [14n(n+1)42^n]

3. Simplify the ratio: In this case, we have:

  a_(n+1)/a_n = [(14(n+1)(n+2)42^(n+1)] / [14n(n+1)42^n]
  a_(n+1)/a_n = [(n+1)(n+2)42] / [n(n+1)]
  a_(n+1)/a_n = (n+2)42 / n

4. Calculate the limit as n approaches infinity:

  lim (n->∞) (n+2)42 / n = 42

5. Apply the Ratio Test: If the limit is less than 1, the series converges; if the limit is greater than 1, the series diverges; if the limit equals 1, the test is inconclusive.

In this case, the limit is 42, which is greater than 1. Therefore, the series is divergent.

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The actual number of elementary operations performed is (n-3) * 6n, and the order for the algorithm segment is n².

The actual number of elementary operations performed when the algorithm segment is executed can be calculated as follows:

1. The outer loop iterates from k=4 to n, which means it runs (n-3) times.
2. The inner loop iterates from j=1 to 6n, which means it runs 6n times.
3. In each iteration of the inner loop, there is one subtraction operation (x := a[k] - b[j]).

Considering these factors, the total number of operations can be expressed as (n-3) * 6n.

By applying the theorem on polynomial orders, we can find that an order for the algorithm segment is n² since the highest degree term in the expression (n-3) * 6n is n².

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The length of the spiraling polar curve [tex]r = 65e^{(2\theta)}[/tex] from θ = 0 to θ = 2π is approximately 2.084×10⁷ units.

To find the length of the spiraling polar curve [tex]r = 65e^{(2\theta)}[/tex] from θ = 0 to θ = 2π, you can follow these steps:

1. Use the polar curve arc length formula:

[tex]L=\int \sqrt{r^2+\left(\frac{d r}{d \theta}\right)^2} d \theta[/tex] from θ = 0 to θ = 2π, where r is the polar curve equation and dr/dθ is its derivative with respect to θ.

2. Differentiate the given polar curve with respect to θ:

[tex]dr/d\theta = 130e^{2\theta}[/tex].

3. Calculate r² + (dr/dθ)²:

[tex](65e^{(2\theta)})^2 + (130e^{(2\theta)})^2 = 65^2 \times e^{(4\theta)} + 130^2 \times e^{(4\theta)}[/tex].

4. Factor the common term and simplify:

[tex]e^{(4\theta)}(65^2 + 130^2) = 21125  e^{(4\theta)}[/tex].

5. Now, find the square root of the expression:

[tex]\sqrt{(21125 \times e^{(4\theta)})} = 145.34 e^{(2\theta)}[/tex].

6. Integrate the expression with respect to θ from 0 to 2π:

[tex]\int145.34 e^{(2\theta)}d\theta[/tex] from θ = 0 to θ = 2π.

7. Perform the integration:

[tex](145.34/2) [e^{4\pi}-e^0][/tex] = 2.084×10⁷ units.

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The 25th percentile of the given set of data is option d , 3.

To find the 25th percentile, we need to first determine the position of the value that corresponds to the 25th percentile.

The formula to find the position is: (25/100) x (n+1), where n is the total number of values in the dataset.

In this case, n = 15, so the position is: (25/100) x (15+1) = 4.

This means that the value at the 4th position in the ordered set of data corresponds to the 25th percentile.

Looking at the ordered set, the 4th value is 3. Therefore, the answer is option d. 3.

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Answer:

8

Step-by-step explanation:

because the relative maximum is 8 as u can see by just eyeballing it

Answer: 9

Step-by-step explanation:

Someone answered this, but I think they eye-balled it a bit incorrectly and mistook it by going up by by 2s and not ones, the maximum point is basically the y-value of where the vertex of the parabola is, in this case, we see the highest point is y=9.

To solve the differential equation 2yy' + 1 = y^2x, we can use separation of variables.

First, we can rearrange the equation to get:

2yy' = y^2x - 1

Next, we can divide both sides by y^2x - 1 to get:

(2y)/(y^2x - 1) dy/dx = 1

We can now integrate both sides with respect to x and y, respectively:

∫(2y)/(y^2x - 1) dy = ∫1 dx

For the left-hand side, we can use substitution by letting u = y^2x - 1, which means du/dy = 2yx.

Substituting this into the integral gives:

(1/2)∫du/u = (1/2)ln|y^2x - 1| + C1

For the right-hand side, we can integrate with respect to x:

∫1 dx = x + C2

Combining the two integrals gives:

(1/2)ln|y^2x - 1| + C1 = x + C2

We can simplify this to:

ln|y^2x - 1| = 2x + C

where C = 2C2 - C1.

Finally, we can exponentiate both sides to get rid of the natural logarithm:

|y^2x - 1| = e^(2x+C)

Since the absolute value of y^2x - 1 can be either positive or negative, we need to consider both cases:

y^2x - 1 = e^(2x+C) or y^2x - 1 = -e^(2x+C)

Solving for y in each case gives:

y = ±sqrt((e^(2x+C) + 1)/x)

Therefore, the general solution to the differential equation 2yy' + 1 = y^2x is:

y = ±sqrt((e^(2x+C) + 1)/x)

where C is a constant of integration.
Hello! To solve the given differential equation 2yy' = y^2x, you can follow these steps:

1. Divide both sides by y^2 to isolate y':

  y' = (x/2) * (1/y)

2. Now, we have a separable equation, so we can separate the variables by multiplying both sides by y:

  y dy = (x/2) dx

3. Integrate both sides with respect to their respective variables:

  ∫y dy = ∫(x/2) dx

  (1/2)y^2 = (1/4)x^2 + C₁

4. To solve for y, multiply both sides by 2:

  y^2 = (1/2)x^2 + 2C₁

5. Take the square root of both sides:

  y = ±√[(1/2)x^2 + 2C₁]

This is the general solution of the given differential equation, where C₁ is an arbitrary constant.

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The average value of the function f on the interval [−2, 2] is 2/9.

To find the average value fave of the function f on the interval [−2, 2], we need to use the formula:

fave = (1/(b-a)) × integral from a to b of f(x) dx

where a and b are the limits of the interval. So in this case, we have:

fave = (1/(2-(-2))) × integral from -2 to 2 of (x^2/(x³ - 10)²) dx

To solve the integral, we can use the substitution u = x³ - 10, which gives us:

du/dx = 3x²
dx = du/(3x²)

Substituting these values, we get:

fave = (1/4) × integral from -2 to 2 of ((1/3u²) × (du/3x²))

Now we can simplify this to:

fave = (1/36) × integral from -2 to 2 of (1/u²) du

Integrating, we get:

fave = (1/36) × (-1/u) from -2 to 2

Plugging in the limits of integration, we get:

fave = (1/36) × ((-1/(2³ - 10)) - (-1/((-2)³ - 10)))

Simplifying, we get:

fave = (1/36) × ((-1/-2) - (-1/-18))

fave = (1/36) × (8/18)

fave = 2/9

Therefore, the average value of the function f on the interval [−2, 2] is 2/9.

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The trigonometric form of 9(cos 20°+i sin 20°)/5(cos 75 i sin 75°) is 9/5 (cos 305° + I sin 305°). So, the correct option is option 2. 9/5 (cos 305° + I sin 305°).

To find 9(cos 20°+i sin 20°)/5(cos 75°+i sin 75°) and write the result in trigonometric form, we will use the division property of complex numbers in polar form:

(9(cos 20°+i sin 20°))/ (5(cos 75°+i sin 75°)) = (9/5) * ((cos 20° + i sin 20°)/(cos 75° + i sin 75°))

To divide complex numbers in polar form,

we divide their magnitudes and subtract their angles:

Magnitude: 9/5
Angle: 20° - 75° = -55°

So, the result is:

9/5 (cos(-55°) + i sin(-55°))

However, we can also write the angle in the positive equivalent:

9/5 (cos(305°) + i sin(305°))

Thus, the answer is: 9/5 (cos 305° + I sin 305°).

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The value of x is (5 ± √153)/4.

What is the area of a rectangle?

The area a rectangle occupies is the space it takes up inside the limitations of its four sides. The dimensions of a rectangle determine its area. In essence, the area of a rectangle is equal to the sum of its length and breadth.

Here, we have

Given: Area of rectangle = 61

Equation : A(x) = 2x² - 5x

We have to find the value of x.

A(x) = 16

16 = 2x² - 5x

2x² - 5x - 16 = 0

we apply here factorization and we get

= (-b ± √b²-4ac)/2a

=  (5 ± √5²+4(2)(16))/2(2)

= (5 ± √25+128)/4

= (5 ± √153)/4

Hence, the value of x is (5 ± √153)/4.

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The ratio of the velocities of the two waves is [tex]\frac{v2,1}{v3,2} = \frac{\frac{8}{k} }{\frac{2}{k} } = 4[/tex].

The wave speed is given by the ratio of the angular frequency to the wave number, v = w/k. The wave velocity, on the other hand, is the rate at which the wave energy or information is transmitted in a medium, and is given by the ratio of the wave amplitude to the wave number, V = A/k, where A is the wave amplitude.

For wave y1(x,t) = 8cos(3(2kx - wt)), the wave speed is v1 = [tex]\frac{w}{k} = \frac{3w}{2k}[/tex]

For wave y2(x,t) = 2cos(3kx + wt), the wave speed is v2 = .[tex]\frac{w}{k} = \frac{w}{k}[/tex]

Therefore, the ratio of the speeds of the two waves is [tex]\frac{v1}{v2} = \frac{3w}{2k} = \frac{3}{2}[/tex]

To find the wave velocities, we need to first determine the wave amplitude for each wave. The wave amplitude is the maximum displacement of the wave from its equilibrium position.

For wave y1(x,t) = 8cos(3(2kx - wt)), the amplitude is 8.

For wave y2(x,t) = 2cos(3kx + wt), the amplitude is 2.

Therefore, the ratio of the velocities of the two waves is [tex]\frac{v2,1}{v3,2} = \frac{\frac{8}{k} }{\frac{2}{k} } = 4[/tex].

The ratio of the velocities of the two waves is independent of their frequencies and depends only on the ratio of their amplitudes. This is because the wave velocity depends only on the properties of the medium through which the wave is propagating, while the frequency depends only on the source of the wave.

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The trigonometry identity value of sin(A) is -3/5.

We have ,

Solving the trigonometry identity

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

cos(A) = 4/5

sin^2(A) + cos^2(A) = 1

so, we get,

sin(A) = ± 3/5

The angle A is in Quadrant IV

The value of sin(A) has already been given

However, because the angle A is in Quadrant IV, the value of the trigonometry identity would be negative

(sine are negative in the 4th quadrants)

So, we have

sin(A) = -3/5

Hence, The trigonometry identity value of sin(A) is -3/5.

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The 99% confidence interval for the population proportion is approximately (0.439, 0.561).

To construct a 99% confidence interval for the population proportion, we will use the following formula:

CI = p-hat ± Z × √[(p-hat × (1 - p-hat)) / n]

where CI represents the confidence interval, p-hat is the sample proportion, Z is the critical value for the desired confidence level, and n is the sample size.

Given the information, x = 125 and n = 250.

1. Calculate p-hat (sample proportion):
p-hat = x / n = 125 / 250 = 0.5

2. Determine the Z-value for a 99% confidence interval (use a Z-table or calculator):
Z = 2.576

3. Plug the values into the formula and calculate the confidence interval:

CI = 0.5 ± 2.576 × √[(0.5 × (1 - 0.5)) / 250]
CI = 0.5 ± 2.576 × √(0.5 × 0.5 / 250)
CI = 0.5 ± 2.576 × √(0.001)

Now, calculate the lower and upper bounds:

Lower bound = 0.5 - 2.576 × √(0.001) ≈ 0.439
Upper bound = 0.5 + 2.576 × √(0.001) ≈ 0.561

Therefore, the 99% confidence interval for the population proportion is approximately (0.439, 0.561).

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Answer:

√29 =c

Step-by-step explanation:

a^2+b^2=c^2

5^2+2^2=c^2

25+4=c^2

29=c^2

√29=c

The values of m for which y=e^mx is a solution of the differential equation y"-5y'+6y=0 are m=-2 and m=-3 (option b).

To find the values of m, we first need to compute the first and second derivatives of y with respect to x:

1. First derivative: y'=me^mx
2. Second derivative: y"=m^2e^mx

Now, we substitute these derivatives into the given equation: m^2e^mx - 5(me^mx) + 6e^mx = 0. Factoring out e^mx, we get: e^mx(m^2 - 5m + 6) = 0. Since e^mx is never zero, the quadratic equation must equal zero: m^2 - 5m + 6 = 0. Factoring this quadratic equation gives (m-2)(m-3)=0, so m=-2 and m=-3 are the solutions.

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Answer:50

Step-by-step explanation: speed = distance/time however we need to convert the minutes into hours so 300/60 which is = to 5
then you do 250/5 which is 50.

Alternatively, we could also restrict the domain of f(x) to a range that excludes the values of x that produce non-unique values of y, such as x = -3, which produces a value of y = 2 for f(x).

what is domain ?

In mathematics, the domain of a function is the set of all possible input values (also called independent variables) for which the function is defined and produces a valid output. It is the set of values that we are allowed to input into the function.

In the given question,

For the inverse of f(x) = x² + 6x + 5 to be a function, we need to ensure that it passes the vertical line test. In other words, for every value of x, the inverse function should produce only one unique value of y.

To ensure that the inverse of f(x) is a function, we need to restrict the domain of f(x) to a range that produces only one value of y for each value of x. This means that we need to make sure that f(x) is one-to-one, or injective, meaning that no two distinct values of x can produce the same value of y.

To check if f(x) is injective, we can use the discriminant of the quadratic equation x² + 6x + 5 = y, which is b² - 4ac, where a = 1, b = 6, and c = 5. The discriminant is:

b² - 4ac = 6² - 4(1)(5) = 16

Since the discriminant is positive, there are two distinct real roots of the quadratic equation, which means that f(x) is not injective and therefore does not have an inverse that is a function.

To ensure that the inverse of f(x) is a function, we need to restrict the domain of f(x) to a range that produces only one value of y for each value of x. One way to do this is to restrict the domain of f(x) to only include the values of x for which the discriminant is non-negative, meaning that the quadratic equation x² + 6x + 5 = y has real roots. This can be expressed as:

b² - 4ac >= 0

6² - 4(1)(5) >= 0

16 >= 0

This inequality is true for all values of x, which means that we can restrict the domain of f(x) to the entire real line to ensure that the inverse of f(x) is a function. Alternatively, we could also restrict the domain of f(x) to a range that excludes the values of x that produce non-unique values of y, such as x = -3, which produces a value of y = 2 for f(x).

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To graph the equation x + 2y - 1 = 9, we can first rearrange it to solve for y:

x + 2y - 1 = 9

2y = 10 - x

y = (10 - x) / 2

Now we can pick three different values of x and find the corresponding values of y using this equation. Let's choose x = 0, x = 2, and x = 4:

When x = 0:

y = (10 - 0) / 2 = 5

So one point on the graph is (0, 5).

When x = 2:

y = (10 - 2) / 2 = 4

So another point on the graph is (2, 4).

When x = 4:

y = (10 - 4) / 2 = 3

So the third point on the graph is (4, 3).

To check if this equation is linear or nonlinear, we can see if it satisfies the property of linearity, which is that if we draw a line between any two points on the graph, all other points on the graph should lie on that same line.

Let's check if this holds true for the three points we've chosen:

If we plot these three points, we get:

   |

 6 |

   |     * (4, 3)

 5 |        

   |   * (2, 4)

 4 |

   | * (0, 5)

 3 +------------------

   0   2   4   6   8  10

Visually inspecting the plot, it looks like all three points do indeed lie on a straight line. Therefore, we can conclude that this equation is linear.

These strings are generated by applying Rule 1 and Rule 2 to strings of length 1 or 2 that are already in S. The base case specifies that the empty string (lambda) and the individual letters 'a' and 'b' are also in S.

We are given a set S of strings over the alphabet {a, b}* and the recursive rules:

Rule 1: xaa ∈ S
Rule 2: xbb ∈ S
Base case: λ ∈ S (empty string), a ∈ S, b ∈ S

Now, we need to list all the strings in S of length 3.

Step 1: Apply Rule 1 to the base case a:
x = a, so xaa = aaa

Step 2: Apply Rule 1 to the base case b:
x = b, so xaa = baa

Step 3: Apply Rule 2 to the base case a:
x = a, so xbb = abb

Step 4: Apply Rule 2 to the base case b:
x = b, so xbb = bbb

So, the strings in S of length 3 are: aaa, baa, abb, and bbb.

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The complete equation of each line for the given problem will be:

1. Perpendicular line:[tex]y = -1/2x + 1[/tex], 2. Parallel line:[tex]y = x + 2[/tex],

3. Perpendicular line: [tex]y = -x + 4[/tex], 4. Parallel line: [tex]y = -x + 4[/tex]

A line equation's slope-intercept form is provided by:

[tex]$y = mx + b$[/tex]

where b stands for the y-intercept, which is the y-coordinate of the point where the line crosses the y-axis, and m stands for the line's slope.

Alternatively, for the point-slope form of a line equation, it is given by:

[tex]$y - y_1 = m(x - x_1)$[/tex]

where, m represents the slope of the line, and  [tex](x_{1} , y_{1} )[/tex]represents a point on the line. When the slope of the line and a point on the line are known, this form is helpful..

1. Line  [tex]y=2x-7[/tex], has a slope of 2 (the coefficient of x), a line perpendicular to it will have a slope that is the opposite reciprocal of 2, which is [tex]-1/2[/tex], [tex](x_{1} , y_{1} )=(4,-1)[/tex]

Using, [tex]$y - y_1 = m(x - x_1)$[/tex]

[tex]y - (-1) = -1/2(x - 4)[/tex]

[tex]y + 1 = -1/2x + 2[/tex]

2. Line, [tex]y=x[/tex], has a slope of 1, a line parallel to it will have the same slope of 1, [tex](x_{1} , y_{1} )= (2,4)[/tex]

[tex]y - 4 = 1(x - 2)\\y - 4 = x - 2\\y = x + 2[/tex]

3. Line, [tex]y=x[/tex], has a slope of 1, a line perpendicular to it will have a slope that is the opposite reciprocal of 1, which is -1, [tex](x_{1} , y_{1} )= (2,2)[/tex]

[tex]y - 2 = -1(x - 2)\\y - 2 = -x + 2\\y = -x + 4[/tex]

4. Line,[tex]y=-x+10[/tex], has a slope of -1 (the coefficient of x), a line parallel to it will have the same slope of -1, [tex](x_{1} , y_{1} )= (-1,5)[/tex]

[tex]y - 5 = -1(x - (-1))\\y - 5 = -x - 1\\y = -x + 4[/tex]

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The equation cos(x - y) = cos(x) - cos(y) is not an identity.

To show that the equation cos(x - y) = cos(x) - cos(y) is not an identity, we need to find a value for x and a value for y such that the left and right sides of the equation are defined but not equal.

Let x = π/2 and y = 0. Then, we have:

cos(x - y) = cos(π/2 - 0) = cos(π/2) = 0

cos(x) - cos(y) = cos(π/2) - cos(0) = 0 - 1 = -1

Since 0 and -1 are not equal, we have found a value for x and a value for y such that the left and right sides of the equation are not equal. Therefore, the equation cos(x - y) = cos(x) - cos(y) is not an identity.

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