What is the interval of decrease/increase of f(x)=-x^2-2x+3

The value of E(Z)=[tex]=e^{\frac{2}{3} }[/tex]

To find the pdf of Z, we need to use the transformation formula for pdfs:

[tex]f_Z(z) = f_X((g)^{(-1)}z ) * |(\frac{d}{dz}) (g)^{-1} (z)|,[/tex]

where [tex]g(x) = e^x[/tex] and [tex](g)^{-1} (z) = ln(z)[/tex] since [tex](e)^{(ln(z)} = z[/tex].

So, we have:

[tex]f_Z(z) = f_X(ln(z)) * |\frac{d}{dz} ln(z)|[/tex]

[tex]=\frac{1}{3z} (for 0 < z < e^2)[/tex]

To find E[Z], we can use the definition of expected value:

[tex]E(Z) = \int\limits {0^{e^{2} } } z f_Z(z) dz \,[/tex]

[tex]E(Z) = \int\limits {0^{e^{2} } } z (\frac{1}{3z} ) dz \,[/tex]

[tex]= (\frac{1}{3} ) \int\limits {0^{e^{2} } } dz \,[/tex]

[tex]= (\frac{1}{3} ) {e^{2} -0 }[/tex]

[tex]=e^{\frac{2}{3} }[/tex]

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The container holding 2. 66 cubic feet can hold about 0.10 cubic yards.

For the conversion of cubic feet to cubic yards, we can divide the volume by appropriate values. There are 3 feet in one yard, so there are (3 feet)³ = 27 cubic feet in one cubic yard.

Therefore, to convert 2.66 cubic feet to cubic yards, we can use the following conversion factor,

1 cubic yard = 27 cubic feet

2.66 cubic feet / 27 cubic feet per cubic yard = 0.0985 cubic yards

Rounding this answer to two decimal places, we get, the container can hold approximately 0.10 cubic yards.

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The function that has the greatest x-intercept is the function h(x)

The x-intercept of a function is the x-value of the function when the y-value is 0, which is the set of points at which the graph of the function intersects the x-axis.

The x-intercept of each function are found as follows;

f(x) = 3·x - 9 = 0

x = 9/3 = 3

g(x) = |x + 3| = 0

(x + 3) > 0 and |x + 3| = x + 3 = 0

x = 0 - 3 = -3

|x + 3| < 0 and |x + 3| = -(x + 3) = 0

x = -3

h(x) = 2·x - 16 = 0

x = 16/2 = 8

x = 8

j(x) = -5·(x - 2)² = 0

The x-intercept is x = 2

The function that has the greatest x-intercept is therefore the function h(x) = 2·x - 16

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No, 4xy³ and -5x³y are not like terms because they cannot be added or subtracted

Algebraic expressions are defined as expressions that are composed of terms, their coefficients, their variables, constants and factors.

These algebraic expressions are also identified with the presence of arithmetic operations, such as;

It is important to note that like terms are terms an algebraic expression have like variables but not always coefficients. These terms also can be added or subtracted.

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The dimensions of the box that minimize the amount of material used are a base side length of 25 cm and a height of 25 cm.

Let x be the side length of the square base and h be the height of the box. Since the box has a square base, the volume of the box is V = x²h. We want to minimize the amount of material used, which is given by the surface area of the box, A = x² + 4xh.

Using the volume constraint, we can solve for h in terms of x: h = V / x² = 62,500 / x². Substituting this into the expression for A, we get A = x² + 4x(62,500 / x²) = x² + 250,000 / x.

To minimize A, we take its derivative with respect to x and set it equal to zero: dA/dx = 2x - 250,000 / x² = 0. Solving for x, we get x = 25 cm. Substituting this back into the expression for h, we get h = 25 cm.

Therefore, base side length is 25 cm and height is 25 cm.

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Since f(-1) is positive and f(5) is negative, by the IVT, there must exist at least one value c in the interval [-1, 5] where f(c) = 0. This means that the function f(x) = x² - 4x has a zero on the interval [-1, 5].

Yes, we can use the Intermediate Value Theorem (IVT) to say that there is a zero of the function f(x) = x² - 4x on the interval [-1, 5].

The IVT states that if f(x) is a continuous function on the closed interval [a, b] and if k is any number between f(a) and f(b), then there exists at least one value c in the interval [a, b] such that f(c) = k.

In this case, we can evaluate f(-1) and f(5) to determine the sign of f(x) at the endpoints of the interval:

f(-1) = (-1)² - 4(-1) = 5

f(5) = 5² - 4(5) = -5

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The calculated probabilities are approximately:
(a) P(Z > -1.75) = 0.9599
(b) P(Z ≤ 1.82) = 0.9656
(c) P(Z < -1.09) = 0.1379

We have,

To calculate probabilities using the standard normal distribution, with the given values

(a) P(Z > -1.75), (b) P(Z ≤ 1.82), and (c) P(Z < -1.09):

1. Identify the Z-score for each probability:
  (a) Z > -1.75
  (b) Z ≤ 1.82
  (c) Z < -1.09

2. Use a standard normal distribution table, calculator, or software (such as ALEKS) to find the probability associated with each Z-score:
  (a) P(Z > -1.75) = 1 - P(Z ≤ -1.75)
  (b) P(Z ≤ 1.82) = P(Z ≤ 1.82)
  (c) P(Z < -1.09) = P(Z ≤ -1.09)

3. Look up the probabilities in the standard normal distribution table or calculate them using a calculator or software:
  (a) P(Z > -1.75) = 1 - 0.0401 = 0.9599 (approx.)
  (b) P(Z ≤ 1.82) = 0.9656 (approx.)
  (c) P(Z < -1.09) = 0.1379 (approx.)

Thus,
The calculated probabilities are approximately:
(a) P(Z > -1.75) = 0.9599
(b) P(Z ≤ 1.82) = 0.9656
(c) P(Z < -1.09) = 0.1379

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The increasing functions in this problem are given as follows:

B and D.

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Answer: 5y^2 +3y+12

Step-by-step explanation:

6y^2+3y+1

y^2-11

equals

5y^2+3y+12

The length of the remaining piece of wooden beam after the cut out in terms of polynomial y is 5y² + 3y + 12

Length of the wooden beam = 6y² + 3y + 1

Length cut out from the wooden beam= y² - 11

Length of the remaining piece of beam = Length of the wooden beam - Length cut out from the wooden beam

= (6y² + 3y + 1) - (y² - 11)

= 6y² + 3y + 1 - y² + 11

= 5y² + 3y + 12

Hence, 5y² + 3y + 12 is the remaining length of the wooden beam.

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The probability that a fruit picked at random weighs between 443 grams and 492 grams is approximately 0.3695 or 36.95%.

To find the probability that a fruit picked at random weighs between 443 grams and 492 grams, we need to standardize these values using the formula:

z = (x - μ) / σ

where x is the weight of the fruit, μ is the mean weight (438 grams), σ is the standard deviation (17 grams), and z is the standardized score.

For the lower end of the range (443 grams), we have:

z = [tex]\frac{(443 - 438)}{17} = 0.29[/tex]

For the upper end of the range (492 grams), we have:

z = [tex]\frac{(492 - 438)}{17} = 3.18[/tex]

Using a standard normal distribution table or calculator, we can find the probability that a standardized score falls between these values.

The probability of a z-score between 0.29 and 3.18 is approximately 0.3695.

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Oni walked at a rate of 66.67 miles per minute on the way home.

We have,

Let's use the formula:

distance = rate x time

Let x be the rate at which Oni walked on the way home (in miles per minute).

On the way to her sister's house,

Oni walked at a rate 25% faster than x, or 1.25x miles per minute.

The distance to her sister's house is half a mile, so it took her:

Time to get there

= distance/rate

= 0.5 / 1.25x

= 0.4x minutes

On the way back home, she walked at a rate of x miles per minute, and it took her:

Time to get back

= distance/rate

= 0.5 / x

= 0.5x minutes

The total time for the round trip was 60 minutes, so we can set up an equation:

Time to get there + time to get back = 60

0.4x + 0.5x = 60

0.9x = 60

x = 66.67 (rounded to two decimal places)

Therefore,

Oni walked at a rate of 66.67 miles per minute on the way home.

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Answer:

x+15 dollars

Step-by-step explanation:

x could be any number, but if you add 15 to x, it would be x+15. Since you don't know what x is, you can't do anything else.

The exact value of the expression is: sin(182°) ≈ -0.1492 (rounded to four decimal places)

To write this expression as a trigonometric function of a single number:

We can use the addition formula for sine and cosine:

sin(a + b) = sin(a) cos(b) + cos(a) sin(b)
cos(a + b) = cos(a) cos(b) - sin(a) sin(b)

Using these expressions, we can rewrite the expression as follows:

sin(11° + 190°) + sin(19°)

Simplifying the first term using the identity sin(a + 180°) = -sin(a),

we get:

sin(201°) - sin(19°)

Now, using the subtraction formula for sine, we can write:

sin(a - b) = sin(a) cos(b) - cos(a) sin(b)

Therefore,

sin(201° - 19°) = sin(182°)

So the exact value of the formula:

sin(182°) ≈ -0.1492 (rounded to four decimal places)

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By showing that a statement is true for a base case and proving that it is true for k+1, assuming that it is true for k, we can show that it is true for all integers in the range of interest.

To show that a formula is true for all integers 1 ≤ k ≤ n, we can use mathematical induction. The process of mathematical induction has two steps: the base case and the induction step.

Base case: Show that the formula is true for k = 1.

Induction step: Assume that the formula is true for some integer k ≥ 1, and use this assumption to prove that the formula is also true for k + 1.

If we can successfully complete both steps, then we have shown that the formula is true for all integers 1 ≤ k ≤ n.

Let's illustrate this with an example. Suppose we want to show that the formula 1 + 2 + 3 + ... + n = n(n+1)/2 is true for all integers 1 ≤ k ≤ n.

Base case: When k = 1, the formula becomes 1 = 1(1+1)/2, which is true.

Induction step: Assume that the formula is true for some integer k ≥ 1. That is,

1 + 2 + 3 + ... + k = k(k+1)/2

We need to prove that the formula is also true for k + 1. That is,

1 + 2 + 3 + ... + (k+1) = (k+1)(k+2)/2

To do this, we can add (k+1) to both sides of the equation in our assumption:

1 + 2 + 3 + ... + k + (k+1) = k(k+1)/2 + (k+1)

Simplifying the right-hand side, we get:

1 + 2 + 3 + ... + k + (k+1) = (k+1)(k/2 + 1/2)

We can rewrite k/2 + 1/2 as (k+2)/2:

1 + 2 + 3 + ... + k + (k+1) = (k+1)(k+2)/2

This is the same as the formula we wanted to prove for k + 1. Therefore, by mathematical induction, we have shown that the formula is true for all integers 1 ≤ k ≤ n.

In summary, mathematical induction is a powerful tool for proving statements about a range of integers. By showing that a statement is true for a base case and proving that it is true for k+1, assuming that it is true for k, we can show that it is true for all integers in the range of interest.

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To prove that the product of two odd integers is odd, we can follow these steps and justifications:

1. Let x and y be two odd integers.
(We start by assuming x and y are odd integers.)

2. x = 2a + 1 and y = 2b + 1, where a and b are integers.
(Since x and y are odd, they can be expressed in this form, as the sum of an even integer (2a or 2b) and 1.)

3. Find the product of x and y: xy = (2a + 1)(2b + 1).
(To show that their product is odd, we multiply x and y.)

4. Expand the product: xy = 4ab + 2a + 2b + 1.
(Using the distributive property to multiply and simplify.)

5. Factor out a 2: xy = 2(2ab + a + b) + 1.
(We factor out a 2 from the even terms to emphasize the structure of the expression.)

6. Let c = 2ab + a + b, where c is an integer.
(We introduce a new variable, c, to represent the sum of the even terms.)

7. Therefore, xy = 2c + 1, where c is an integer.
(Substituting c back into the expression for xy.)

8. The product xy is an odd integer.
(Since xy is in the form of an even integer (2c) plus 1, it is an odd integer.)

In conclusion, the product of two odd integers (x and y) is also an odd integer, as we have proven through these steps and justifications.

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The quadratic equation is solved and the y intercept is A ( 0 , 4 ) and the roots of the given equation are complex numbers

Given data ,

Let the quadratic equation be represented as A

Now , the value of A is

y = x² + 3x + 4

On simplifying , we get

the y-intercept of this equation, we set x = 0 and solve for y:

y = 0² + 3(0) + 4

y = 0 + 0 + 4

y = 4

So, the y-intercept of the given quadratic equation is (0, 4)

And , the roots of the equation is

x = [ -b ± √ ( b² - 4ac ) ] / ( 2a )

x = (-3 ± √(3² - 4(1)(4))) / (2(1))

x = (-3 ± √(9 - 16)) / 2

x = (-3 ± √(-7)) / 2

So , the roots are complex numbers

Hence , the quadratic equation is solved

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The measure of the missing angle which is named ∠PQR = 84°

The first step to solving the problem is to identify the nature of the triangle.

Note that the information states that:

Side PQ and QR are equal,
This means that it is an isosceles triangle because only isosceles triangles have two equal sides.

Another property of isosceles triangles that will help determine the m∠PQR is that the angles at the base of those equal sides are always equal.

Since that is true, then,

∠PQR = 180 - (QPR x 2 )

We know ∠QPR is 48°, so


∠PQR = 180 - (48x 2 )

∠PQR = 180 - 96

Thus,

∠PQR = 84°

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Full Question:

Although part of your question is missing, you might be referring to this full question:

See attached image.

The y-intercept provides a useful reference point for understanding the relationship between X and Y in the model.

In the equation [tex]Y ^[/tex] = 39 - .0035X, the y-intercept represents the value of Y when X is equal to 0. This is because when X is 0, the term .0035X becomes 0 and the equation simplifies to[tex]Y ^[/tex] = 39.

Therefore, the y-intercept in this equation is 39. This means that when X is equal to 0, the predicted value of Y is 39.

It's important to note that this does not necessarily mean that the actual value of Y is 39 when X is 0, as the equation is a linear regression model and there may be variability in the data. However, the y-intercept provides a useful reference point for understanding the relationship between X and Y in the model.

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The volume of the solid enclosed by the paraboloid z = x² + y² and the plane z = 9 is V = 36π[tex]V = 36π[/tex] cubic units.

The solid is enclosed by the paraboloid z = x² + y² and the plane z = 9 is a region in 3D space that has a finite volume. To find the volume of this solid, we can use a method called triple integration.

We need to determine the limits of integration for each variable. Since the paraboloid is symmetric about the z-axis, we can integrate over one quadrant and multiply by four to get the total volume. In this case, we can integrate from 0 to 3 for both x and y, and from x² + y² to 9 for z.

The triple integral for the volume is then: [tex]V = 4 * ∫∫∫ z dz dy dx[/tex] Limits: 0 to 3 for x 0 to 3 for y x² + y² to 9 for z. Solving this integral gives us:[tex]V = 36π[/tex]

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Answer:

(3,1)

Step-by-step explanation:

If A and B are mutually exclusive, then the correct answer is c. P(A ∩ B) = 0. This is because mutually exclusive events cannot occur at the same time, meaning the intersection of the events is empty. Therefore, the probability of A and B occurring together is zero.

To explain further, if A represents the event of flipping heads on a coin and B represents the event of flipping tails on the same coin, then these events are mutually exclusive because both cannot occur at the same time. The probability of flipping heads or tails on a coin is 1, but the probability of flipping heads and tails simultaneously is 0. Therefore, P(A ∩ B) = 0.

It is important to note that if A and B are mutually exclusive, then P(A) + P(B) = 1, which is answer choice d. This is because one of the events must occur, but not both. Therefore, the total probability of either A or B occurring is 1. However, this does not directly answer the question about the probability of the intersection of A and B.

Overall, when working with mutually exclusive events, it is important to recognize that they cannot occur at the same time and therefore have no intersection, which makes the probability of A and B occurring together equal to 0.

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If A and B are mutually exclusive events, this signifies that they cannot both happen simultaneously. Therefore, the probability of both events occurring, expressed as P(A ∩ B), is equal to 0.

If A and B are mutually exclusive, it means that events A and B cannot occur at the same time. In terms of probability, we express this statement as: the probability that both A and B occur, denoted by P(A ∩ B), is equal to 0. Hence the correct answer is: c. P(A ∩ B) = 0.

This is fundamental in the study of probability and is crucial for understanding more complex concepts such as conditional probability and independence of events.

It's important to note that answers a, b and d are incorrect. Answer a, P(A) + P(B) = 0, implies that neither event can happen which contradicts the definition of mutually exclusive events. Answer b, P(A ∩ B) = 1, implies that A and B must always occur together, which is the exact opposite of what mutual exclusivity means. Answer d, P(A) + P(B) = 1, would be correct if A and B were exhaustive events, which means that either event A or event B is certain to occur.

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Answer:

Intercept Form.

You can directly solve for x by setting them to zero to which X= 3, X= -2

x-3 = 0  x+2 =0

x= 3  x= -2

The present age of the Father is 35 and the age of the Son is 15 years after solving the given problem.

By examining the given problem we can solve it in the following way:

Present age:

Let x = Son's present age

x + 20 = Father's present age

5 years ago:

x - 5 = Son's age 5 years ago

x + 20 -5 = father's age 5 years ago

Father's age 5 years ago = 3( Son's age 5 years ago )

x + 20 - 5 = 3 (x - 5)

x + 15 = 3x - 15

2x = 30

x = 15

x = 15, Son's present age

x + 20 = 35 = father's present age.

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(a) 248 to decimal
Since it's already in decimal form, there's no need for conversion.
Answer: 248

(b) 2416 to decimal (assuming it's a hexadecimal number)
Step 1: Identify the place values of the hexadecimal number (from right to left): 1, 16, 256
Step 2: Multiply the digits by their place values and sum them up: (2 * 256) + (4 * 16) + (1 * 1) = 512 + 64 + 1 = 577
Answer: 577

(c) 2c16 to decimal (assuming it's a hexadecimal number)
Step 1: Identify the place values of the hexadecimal number (from right to left): 1, 16, 256
Step 2: Convert the letter "c" to its decimal equivalent: C = 12
Step 3: Multiply the digits by their place values and sum them up: (2 * 256) + (12 * 16) + (1 * 1) = 512 + 192 + 1 = 705
Answer: 705

(d) 00110011101000112 to hexadecimal
Step 1: Group the binary digits into sets of four from right to left: 0011 0011 1010 0011
Step 2: Convert each group of four binary digits into their corresponding hexadecimal values:
      0011 = 3
      0011 = 3
      1010 = A
      0011 = 3
Step 3: Combine the hexadecimal values: 33A3
Answer: 33A3

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It will take God approximately 32 days to use up all the gas in his tanker and need a refill.

If God filled his gas tanker with 19/5/9 tank of gas and uses 1 5/6 gallons of gas each day, we can calculate how many days it will take for him to need a refill.

First, we need to convert the mixed number 19/5/9 to an improper fraction:

19/5/9 = (19 * 9 + 5) / 9 = 176/9

So God has 176/9 tanks of gas in his tanker.

Next, we can calculate how much gas God uses each day:

1 5/6 = (6 * 1 + 5) / 6 = 11/6

So God uses 11/6 gallons of gas each day.

To find out how many days it will take for God to need a refill, we can divide the amount of gas in his tanker by the amount of gas he uses each day:

(176/9) / (11/6) = (176/9) * (6/11) = 32

Therefore, it will take God approximately 32 days to use up all the gas in his tanker and need a refill.

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The probability of rolling a single six-sided die and getting a 2, 3, 4, or 5 is:
4/6 or 2/3

To determine the probability of the given outcome or event using the theoretical method, follow these steps:

1. Identify the total number of possible outcomes when rolling a single six-sided die. In this case, there are 6 possible outcomes (1, 2, 3, 4, 5, or 6).

2. Identify the number of successful outcomes, which are the outcomes that meet the criteria of the event. In this case, the successful outcomes are rolling a 2, 3, 4, or 5. There are 4 successful outcomes.

3. Calculate the probability by dividing the number of successful outcomes by the total number of possible outcomes. In this case, the probability is:

Probability = (Number of successful outcomes) / (Total number of possible outcomes)
Probability = 4/6

4. Simplify the fraction if possible. In this case, you can simplify 4/6 to 2/3.

The probability of rolling a single six-sided die and getting a 2, 3, 4, or 5 is 2/3.

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The formula to find the present value of an ordinary annuity is:

PV = PMT x ((1 - (1 + r)^-n) / r)

Where PV is the present value, PMT is the payment amount, r is the interest rate per compounding period, and n is the total number of compounding periods.

In this case, the payment amount is $85, the interest rate per quarter is 8%/4 = 2%, and the total number of quarters is 10 x 4 = 40.

Plugging these values into the formula, we get:

PV = $85 x ((1 - (1 + 0.02)^-40) / 0.02)
PV = $85 x ((1 - 0.296) / 0.02)
PV = $85 x (0.704 / 0.02)
PV = $85 x 35.2
PV = $2,992

Rounding to the nearest cent, the answer is $2,992.00. None of the given answer choices match this result.

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If the approximate areas of Colorado and Hawaii are listed as Colorado: 2.7 x 105 square kilometers. The amount  larger is Colorado is: 2.417 x 10^5.

The first step is to divide the area of Hawaii by the area of Colorado and before we do that we must ensure that both of these figures have the same exponent.

So,

2.7 x 10^5 square km - 2.83 x 10^4 square km

2.83 x 10^4 = 0.283 x 10^5

Hence,

2.7 x 10^5 - 0.283 x 10^5

= 2.417 x 10^5

Therefore  Colorado is 2.417 x 10^5 square kilometers larger than Hawaii.

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The value of x in the right triangle with acute angles 8x and 4x + 6 is 7

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

The right triangle with acute angles 8x and 4x + 6

The sum of acute angles in a right triangle is 90

Using the above as a guide, we have the following:

8x + 4x + 6 = 90

So, we have

12x = 84

Divide by 12

x = 7

Hence, the value of x is 7

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B) Note that in the prompt above, you can use translation to map the line y= 2x -4 onto the line y = 2x + 4.

While you can use axial symmetry in the y -  axis to map the line  y = x onto the line y = -x.

Axial symmetry is symmetry around an axis; an item is axially symmetric if it retains its appearance when rotated around an axis.

A baseball bat with no brand or other design, or a plain white tea saucer, for example, looks the same when rotated by any angle around the line traveling longitudinally through its center, indicating that it is axially symmetric.

A transformation in which the coordinate system's origin is shifted but the orientation of each axis remains constant

So for B) you can use a translation to map the line y = 2x -4 onto the line y = 2x + 4 by shifting the first line 4 units upwards along the y - axis....

mathematically, that would be:

y = 2x - 4 + 4

y = 2x


For C) you can use axial symmetry on the y -  axis to achhieve the mapping of y = x onto y = -x by reflection.

The polar opoppsite of y = x  is y = -x.

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