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Post Test: Ratios and Proportional Relationships
Select the correct answer.
Area Buckeye Butterflies Monarch Butterflies
A
B
C
D
E
Rachel traveled to five different areas (A, B, C, D, and E) to study the number of buckeye butterflies and the number of monarch butterflies living
there. The table shows her findings.
OA
OB.
n. All rights reserved
15
27
12
24
44
areas A and B
areas C and E
Submit Test
16
36
25
32
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The relationship between the number of buckeye butterflies and the number of monarch butterflies is not proportional across all areas. Which two
areas have buckeyes and monarchs in the same proportion?
Reader Tools

Answer: -5/4

Step-by-step explanation:

The correct solution is,

D. Mean = 50.4,

Variance = 27.2,

Standard deviation = 5.2.

Now, Formula for the mean, variance, and standard deviation of the given values,

Mean (μ) = (Σx) / n

Variance (σ) = (Σ(x-μ)) / n

Standard deviation (σ) = sqrt(σ)

where: Σx = sum of the values

Σ(x-μ)² = sum of the squared differences between each value and the mean

n = number of values

Substituting the given values into these formulas, we get:

Mean (μ) = (50 + 46 + 53 + 51 + 52) / 5

Mean (μ) ≈ 50.4

Variance (σ) = [(14 - 50.4)² + (50 - 50.4)² + (-0.4 - 50.4)² + ... + (2.6 - 50.4)] / 13

Variance (σ) ≈ 27.2

Standard deviation (σ) = √(27.2)

Standard deviation (σ) ≈ 5.2

Therefore, the correct answer is,

D. Mean = 50.4,

Variance = 27.2,

Standard deviation = 5.2.

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Borrowing $50,000 for 30 years at 11% instead of 10% would result in an extra cost of approximately $44.63 per month.

To estimate the extra cost per month of borrowing $50,000 for 30 years at 11% instead of 10%, you can follow these steps:

Calculate the monthly payment for each interest rate:

The formula to calculate the monthly payment for a fixed-rate loan is:

M = P * (r * (1 + r)^n) / ((1 + r)^n - 1)

Where:

M is the monthly payment,

P is the principal amount (loan amount),

r is the monthly interest rate (annual interest rate divided by 12),

n is the total number of monthly payments (number of years multiplied by 12).

Let's calculate the monthly payment at 10% interest rate first:

P = $50,000

r = 10% / 100 / 12 = 0.0083333 (monthly interest rate)

n = 30 years * 12 = 360 (total number of monthly payments)

M1 = $50,000 * (0.0083333 * (1 + 0.0083333)^360) / ((1 + 0.0083333)^360 - 1)

Calculate the monthly payment at 11% interest rate using the same formula:

P = $50,000

r = 11% / 100 / 12 = 0.0091667 (monthly interest rate)

n = 30 years * 12 = 360 (total number of monthly payments)

M2 = $50,000 * (0.0091667 * (1 + 0.0091667)^360) / ((1 + 0.0091667)^360 - 1)

Calculate the difference in monthly payments:

Extra cost per month = M2 - M1

Now let's perform the calculations:

M1 ≈ $446.92 (monthly payment at 10% interest rate)

M2 ≈ $491.55 (monthly payment at 11% interest rate)

Extra cost per month = $491.55 - $446.92 ≈ $44.63

Therefore, borrowing $50,000 for 30 years at 11% instead of 10% would result in an extra cost of approximately $44.63 per month.

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No, there are x values which map to more than 1 y-value.

Given that Matthew examines the relation as shown in the below.

{(4, -11), (3,1), (0,1), (2,6), (3, -1)}

We need to check whether the relation is a function or not,

So, we know that,

A relation can map inputs to multiple outputs. It is a function when it maps each input to exactly one output. The set of all functions is a subset of the set of all relations.

If any x values are repeated, and the corresponding y values are different, then we have a relation and not a function.

Here we can see that the y values are repeated, so it is not a function.

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The height d as shown in the right angled triangle is 4.95.

Height is the vertical distance between two points.

To calculate the height d as shown in the right angled triangle, we use the formula below

Formula:

From the diagram in the question,

Given:

Substitute these values into equation 1

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Answer:

B

Step-by-step explanation:

3√5/√11 = 2.02

3√55/11 = 2.02

so,

3√5/√11 = 3√55/11

The value of variables a and b are,

a = - 4,

b = - 2

WE have to given that;

Function is,

⇒ f (x) = x³ - 12x² + 48x - 62

Now, We can simplify for change the function in the form of

f (x) = (x + a)³ + b as;

⇒ f (x) = x³ - 12x² + 48x - 62

⇒ f (x) = x³ - 12x² + 48x - 62 - 2 + 2

⇒ f (x) = (x - 4)³ + 2

Hence, We get;

By comparing we get;

a = - 4,

b = - 2

Thus, The value of variables a and b are,

a = - 4,

b = - 2

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Answer: $275

Step-by-step explanation:

The perimeter of the tri9angle MNO is P = 58 units.

The perimeter of the triangle is equal to the sum of the lengths of the sides, we know that:

OM = 23

NM = 18.4

To find the missing side we can use the similar triangle that we have next to it.

We can see that that OM is correspondent to LJ

Then if the scale factor between the triangles is K, we can write:

18.4  = 10*K

18.4/10 = K = 1.84

Now, NO is correspondent to KL, then:

NO = 1.84*9

NO = 16.6

Then the perimeter is:

P = 16.6 + 23 + 18.4

P = 58 units.

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Given statement solution:- The fewer people in the 18-25 year age group result is negative, it indicates that the 18-25 year age group has more people with some form of technology career than all other age groups combined. None of the options provided (a, b, c, d) are correct.

To find the number of fewer people in the 18-25 year age group with some form of technology career compared to all other age groups combined, we need to sum up the technology career numbers for all age groups except the 18-25 year age group and then subtract it from the number for the 18-25 year age group.

Sum of technology career numbers for age groups other than 18-25 years:

(41+ yrs) + (36-40 yrs) + (26-35 yrs) = 24312 + 3.215 + 2.709 = 24318.924

Number of fewer people in the 18-25 year age group compared to all other age groups combined:

1673 - 24318.924 = -22645.924

Since the fewer people in the 18-25 year age group result  is negative, it indicates that the 18-25 year age group has more people with some form of technology career than all other age groups combined. Therefore, none of the options provided (a, b, c, d) are correct.

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Answer:

Step-by-step explanation:

You want to know the postulate used to declare the triangles similar, and the corresponding similarity statement.

The side length ratios of the larger triangle are ...

  45 : 63 : 90 = 5 : 7 : 10 . . . . . divide by 9

For the smaller triangle, they are ...

  25 : 35 : 50 = 5 : 7 : 10 . . . . . divide by 5

The ratios of the three side lengths are the same, so the triangles are similar by the SSS postulate.

One triangle is designated as ∆KLM. In terms of (reduced) ratio units, the sides in order are ...

  KL = 10, LM = 7, MK = 5

The corresponding sides in the smaller triangle are ...

  UT = 10, TS = 7, SU = 5

This means the similarity statement must be written as ...

  ∆KLM ~ ∆UTS . . . . . . matches the last choice

__

Additional comment

It is generally helpful to list the sides in some recognizable order (here, longest to shortest) so that the correspondence is clear.

<95141404393>

Answer:f=60a(60)

hope this helps bye

Answer:

Number of TAILS outcomes = 100 - 58 = 42

Experimental probability of TAILS = Number of TAILS outcomes / Total number of outcomes = 42/100 = 0.42

The theoretical probability of getting HEADS or TAILS is 0.5 each, assuming the penny is fair.

The experimental probability of HEADS is 58/100 = 0.58, which is close to the theoretical probability of 0.5. This suggests that Aaron's experiment is consistent with the theoretical probability. Similarly, the experimental probability of TAILS is 0.42, which is also close to the theoretical probability of 0.5. This further supports the idea that the penny is fair.

Answer:

Step-by-step explanation:express the 15% as a fraction divided by 100.Multiply the result by $9000.

The result is $ 1350

Subtract the result from new price of the car.$9000-$1350

=$7650

The solution is, After decreasing £16870 by 3% we get, £16363.90.

Here, we have,

A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%".

First, find the percentage of £16870 by 3%

%value = 3% * 16870

           = (3 / 100) * 16870

           = 506.1

Now, just minus with actual value

New value = actual value - %value

We know, actual value = £16870 and %value = 506.1

so, New value = 16870 - 506.1

we get, New value = £16363.90

Therefore, After decreasing £16870 by 3% we get, £16363.90

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complete question:

Decrease £16870 by 3%

Give your answer rounded to 2 DP.

Answer:

2ab(b + 4 - 3a)

Step-by-step explanation:

a^2b + 2ab^2 + 8ab - 7a^2b

= 2ab^2 + 8ab + a^2b - 7a^2b

= 2ab^2 + 8ab - 6a^2b

= 2(ab^2 + 4ab - 3a^2b)

= 2a(b^2 + 4b - 3ab)

= 2ab(b + 4 - 3a)

Answer:

[tex]\Huge \bold{\boxed{\boxed{\text{5\%}}}}[/tex]

Step-by-step explanation:

To calculate the margin of error for the survey, we need to use the formula:

[tex]\large \text{Margin of error} = \large \text{$\frac{\text{Range of values}}{2}$}[/tex]

The range of values is the difference between the upper and lower bounds of the interval. In this case, the lower bound is 22% and the upper bound is 32%, so the range of values is:

[tex]\large \text{Range of values = 32\% - 22\% = 10\%}[/tex]

Substituting this value into the formula, we get:

[tex]\large \text{Margin of error = $\frac{10\%}{2}$ = 5\%}[/tex]

Therefore, the margin of error on the survey is 5%.

Answer:

begin equation begin cases x = 1y = 5 end cases end equation. Rearrange like terms to the same side of the equation

Step-by-step explanation:

begin equation begin cases x = 1y = 5 end cases end equation. Rearrange like terms to the same side of the equation

Answer:

Step-by-step explanation:

[tex]log_{4}2x = 5 \\2x = 4^5\\2x = 2^{10}\\x = \frac{2^{10}}{2}\\ x = 2^9\\x = 512[/tex]

Mistake is in step - 3 .

The difference between 1/5 and 2/10 is that they are different representations of the same value.

The ratio is a comparison of two quantities while proportional reasoning involves finding an equivalent ratio.

"Fifth" can refer to the ordinal number of a position or the unit fraction 1/5.

The diagram can be used to illustrate fraction concepts.

1/5 is simple, but 2/10 can be reduced to 1/5 by dividing both numbers by 2. They are both 0.2 or 20%. 1/5 and 2/10 are different fractions with different purposes.

Use 1/5 for 5 parts and 1/5 (simplified from 2/10) for 10 parts. 1/5 and 2/10 = 0.2, ratio reasoning emphasizes ratios between quantities. A 2:3 boys-to-girls ratio compares the constant ratio between changing quantities.

Proportional reasoning maintains constant ratios between quantities, while ratio reasoning uses fractions or ratios to compare relationships. For instance, if distance doubles, so does speed.

Step 3/5: "Fifth" is the ordinal number for the object five places away in a sequence. See diagram. The fifth circle is 1/5 of a whole in unit fraction sequence. Imagine a rectangle divided into five equal parts, each shaded to show 1/5. Shaded part = 1/5 of whole.

To show 25/7 with area model, make 7x25 rectangle and split into 7 equal parts. 25/7 per part.

1.2 The set model:

To represent 25/7, divide 25 objects into 7 equal sets, resulting in 3 objects per set with 1 left over. This represents the fraction of 25/7.

1.3 The length model:

To show 25/7 on a length model, draw a line of 25 units and divide it into seven equal parts. Each part represents 1/7 or 25/7.

Step 5/5

Let's assume the width of the rectangular piece of paper as x cm. Then the length of the paper would be:

Now we know that the perimeter of the rectangle is given by the formula:

So, for this rectangle:

54 = 2(5x + x)

Simplifying and solving for x, we get:

54 = 2(6x)

27 = 6x

x = 4.5 cm

Therefore, the width of the paper is 4.5 cm and the length is 5 times the width which is 22.5 cm.

The difference between 1/5 and 2/10 is that they are different representations of the same value.

The ratio is a comparison of two quantities while proportional reasoning involves finding an equivalent ratio.

"Fifth" can refer to the ordinal number of a position or the unit fraction 1/5.

The diagram can be used to illustrate fraction concepts.

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The maximum possible volume for a piece of carry-on luggage is given as follows:

2772 cubic inches.

The volume of a rectangular prism, with dimensions length, width and height, is given by the multiplication of these dimensions, according to the equation presented as follows:

Volume = length x width x height.

The dimensions for this problem are given as follows:

22 inches, 14 inches and 9 inches.

Hence the volume is given as follows:

22 x 14 x 9 = 2772 cubic inches.

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Siama and Wills used different methods to find the differences between (5x + 6x) and (2x - 1) but they both arrived at the same answer.

I prefer Wills method because it is easier and less complicated.

Wills method:

(5x + 6x) - (2x - 1)

Subtract both 2x and -1

5x + 6x - 2x - - 1

5x + 4x + 1

In conclusion, Wills method is preferred when both methods are compared.

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The number of additional copies you could ship by ordering 128 instead of 127 copies is 0 copies.

We have,

To determine the number of additional copies you could ship if you ordered 128 copies instead of 127 copies, we need to compare the costs of ordering each quantity using the given function C(n).

For n = 127:

C(127) = $6.91 x 127 = $878.57

For n = 128:

C(128) = $5.16 x 128 = $660.48

By subtracting the cost of ordering 127 copies from the cost of ordering 128 copies, we can determine the cost difference:

Cost difference = C(128) - C(127)

= $660.48 - $878.57

= -$218.09

Since the cost difference is negative, it means that ordering 128 copies is cheaper than ordering 127 copies.

However, the question asks for the number of additional copies, so we need to consider the whole number of copies.

Rounding down to the nearest whole copy, the number of additional copies you could ship by ordering 128 instead of 127 copies is 0 copies.

Thus,

The number of additional copies you could ship by ordering 128 instead of 127 copies is 0 copies.

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The period of the function is 4π, and the amplitude is 2.

Given data ,

Let the function be represented as f ( x ) = y

Now , the value of f ( x ) is

y = 2sin ( 1/2 )x

To find the period and amplitude of the function y = 2sin((1/2)x), we can use the standard form of a sine function: y = Asin(Bx).

In this case, the amplitude (A) is 2.

The amplitude represents the maximum displacement from the midpoint of the sinusoidal function.

To find the period, we can use the formula:

Period = (2π) / |B|.

B = 1/2.

Period = (2π) / |1/2|

P = (2π) / (1/2) = 2π * 2/1 = 4π

Hence , the period of the function is 4π, and the amplitude is 2.

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The value of x from given parallel lines is 2.

In the given figure, three lines are parallel and two lines are passing through.

When three or more parallel lines are cut by two transversals, the line segments formed are proportional.

That is, 2x/x = (x+4)/(4x-5)

2/1 = (x+4)/(4x-5)

2(4x-5)=1(x+4)

8x-10=x+4

8x-x=4+10

7x=14

x=2

Therefore, the value of x from given parallel lines is 2.

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The Probability of Boris' character casting a spell is 8/15, based on the given odds in favor of 8/7.

The probability of Boris' character casting a spell, we can use the odds in favor of casting a spell. The odds in favor are given as 8/7.

Odds in favor of an event are calculated as the ratio of the number of favorable outcomes to the number of unfavorable outcomes. In this case, the favorable outcomes are the instances where Boris' character casts a spell, and the unfavorable outcomes are the instances where his character does not cast a spell.

Let's represent the probability of casting a spell as P(casting spell). We can use the formula for odds in favor to find the probability:

Odds in favor = Favorable outcomes / Unfavorable outcomes

8/7 = Favorable outcomes / Unfavorable outcomes

To solve for the probability, we need to convert the odds into a fraction. We can do this by considering the odds as a ratio of favorable outcomes to the total number of outcomes.

The odds can be written as:

8/(8+7) = Favorable outcomes / (Favorable outcomes + Unfavorable outcomes)

8/(8+7) = Favorable outcomes / Total outcomes

8/15 = Favorable outcomes / Total outcomes

Since the total outcomes represent all possible outcomes, the denominator represents the total number of outcomes, which includes both the favorable and unfavorable outcomes.

Therefore, the probability of Boris' character casting a spell is 8/15.

In summary, the probability of Boris' character casting a spell is 8/15, based on the given odds in favor of 8/7.

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Answer:

(d) -12

Step-by-step explanation:

3a = _____

a = -4

3(-4) = ___

3(-4) = -12

The answer is (d) -12

The length of the ladder is 4.72 meters and its angle of elevation is 30.4 degrees.

Using the Pythagorean theorem:

Length of the ladder = √(height² + horizontal distance²)

= √(2.35² + 4.10²)

= √(5.5225 + 16.81)

= √22.3325

≈ 4.72 meters

To calculate the angle of elevation (θ), we can use the trigonometric function sine:

sin(θ) = height / length of the ladder

θ = arcsin(height / length of the ladder)

θ = arcsin(2.35 / 4.72)

θ ≈ 30.4 degrees

Therefore, the length of the ladder is 4.72 meters and its angle of elevation is 30.4 degrees.

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The Translation of given question is:

A ladder is being constructed that starts at 4.10 m and reaches a height of 2.35 m. Calculate the length of the ladder and its angle of elevation.

The third root of 11 lies between the whole numbers 2 and 3.

The estimate of a non-exact root of x is done finding two numbers, as follows:

The number for this problem is given as follows:

Cubic root of 11.

For the parameters, we have that:

Hence the third root of 11 lies between 2 and 3, as 2³ < 11 < 3³.

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The expected value of the winnings from the game is $3.24.

To find the expected value of the winnings, we multiply each possible payout by its corresponding probability and sum them up.

Expected Value = (2 x 0.64) + (4 x 0.18) + (6 x 0.12) + (8 x 0.04) + (10 x 0.02)

Expected Value = 1.28 + 0.72 + 0.72 + 0.32 + 0.20

Expected Value = 3.24

Therefore, the expected value of the winnings from the game is $3.24.

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