in a recent study, 90% of the homes in the united states were found to have large-screen tvs. in a sample of nine homes, what is the probability that:

John and his three passengers travel a total of 20.25 miles on the toll lane.

To solve this problem, we can use the fact that each person pays about $0.81, which includes their contribution to the toll lane entry fee. This means that the total amount of money paid by John and his three passengers is 4 times $0.81, or $3.24.

We can then use this information to find the cost per mile of the toll lane. If they traveled a total of x miles on the toll lane, then the cost per mile would be:

$3.24 / x

We can set this equal to the given cost of 16 cents per mile:

$0.16 = $3.24 / x

Multiplying both sides by x, we get:

x * $0.16 = $3.24

Dividing both sides by $0.16, we get:

x = $3.24 / $0.16

x = 20.25 miles

In summary, to find the distance they traveled on the toll lane, we used the fact that they split the cost of the toll, and that each person paid about $0.81. We then set the cost per mile equal to the given cost of 16 cents per mile, and solved for the distance traveled on the toll lane, which turned out to be 20.25 miles.

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Both methods are valid and result in the same answer.

In mathematics, the term "congruent" refers to figures and shapes that can be flipped or rearranged to match up with other ones. These forms can be mirrored to produce related shapes.

If two shapes are similar in size and shape, they are congruent. We can also state that if two shapes are congruent, then their mirror images are identical.

Both students are correct.

Student A divides the Z into 4 congruent right triangles and 2 rectangles. The area of the right triangles is found by multiplying the base and height and dividing by 2, while the area of the rectangles is found by multiplying the length and width. Adding the areas of all the shapes together, the total area of the Z is 32 square units.

Student B divides the Z into 3 congruent right triangles and 3 rectangles. The area of the right triangles is found by multiplying the base and height and dividing by 2, while the area of the rectangles is found by multiplying the length and width. Adding the areas of all the shapes together, the total area of the Z is also 32 square units.

Both methods are valid and result in the same answer.

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Answer: I'm sorry, but I cannot provide answer sheets or solutions to specific assignments or assessments. It is important for you to try to solve the problems yourself to gain a better understanding of the concepts. If you are struggling with a specific problem or concept, I would be happy to help you work through it.

a) The graph for the function [tex]A = 225 - 3.14r^2[/tex] is a downward sloping parabola.

b) The x-values make sense for the domain is a non-negative number.

c) The y-values make sense for the range is  0≤ A≤ 25.

In mathematics, a graph is a collection of points, called vertices or nodes, and edges that connect pairs of vertices.

a. To graph the function [tex]A = 225 - 3.14r^2[/tex]. The graph should be a downward-sloping parabola, opening downwards.

b. The domain of the function represents the possible values of r. Since the radius of a circle cannot be negative, the x-values (or the values of r) that make sense for the domain are non-negative numbers, i.e., r >= 0.

c. The range of the function represents the possible values of A, the area to be painted blue. Since the poster board is 15 in wide, the maximum area that can be painted blue is 225 sq in (15 in x 15 in). Since the area of the circular drawing is given by [tex]3.14r^2[/tex], the area to be painted blue can be no greater than 225 sq in, which occurs when the circular drawing has a radius of 0. Therefore, the y-values (or the values of A) that make sense for the range are 0 <= A <= 225.

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Answer:

[tex]\dfrac{4}{3}[/tex]

Step-by-step explanation:

We can find the y-intercept of this line by:

1) finding the slope using the given points

[tex]m = \dfrac{8-(-7)}{4-(5)}[/tex]

[tex]m = \dfrac{8+7}{4+5}[/tex]

[tex]m = \dfrac{15}{9}[/tex]

[tex]m=\dfrac{5}{3}[/tex]

2) forming an equation for the line using point slope form

[tex]y - b = m(x - a)[/tex]     where [tex](a,b)[/tex] is a point on the line

... using the point (4,8)

[tex]y - 8 = \frac{5}{3}(x - 4)[/tex]

3) plugging 0 in for x to get the y-intercept

[tex]y - 8 = \frac{5}{3}(0 - 4)[/tex]

[tex]y - 8 = \frac{5}{3}(-4)[/tex]

[tex]y = 8 -\frac{20}{3}[/tex]

[tex]y = \frac{24}{3} -\frac{20}{3}[/tex]

[tex]\boxed{y=\dfrac{4}{3}}[/tex]

The probability of choosing a blue marble from both bags is 0.21 or 21%.

Probability is a measure of the likelihood or chance that a particular event will occur. It is typically expressed as a number between 0 and 1, with 0 indicating that the event is impossible and 1 indicating that the event is certain to occur.

Let B1 and B2 denote the events of choosing a blue marble from bag 1 and bag 2, respectively. We want to find the probability of the event B1 ∩ B2, which is the probability of choosing a blue marble from both bags.

We know that:

P(B1) = 0.3 (the probability of choosing a blue marble from bag 1)

P(B2) = 0.7 (the probability of choosing a blue marble from bag 2)

Assuming that the events B1 and B2 are independent, we can use the formula for the intersection of two independent events:

P(B1 ∩ B2) = P(B1) * P(B2)

Substituting the values we know, we get:

P(B1 ∩ B2) = 0.3 * 0.7 = 0.21

Therefore, the probability of choosing a blue marble from both bags is 0.21 or 21%.

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In table 9.1, the marginal cost of producing the seventh unit of output is equal to $8.
Marginal cost refers to the additional cost incurred when producing one more unit of output. To find the marginal cost of producing the seventh unit of output, follow these steps:

1. Locate the total cost column in table 9.1.
2. Identify the total cost of producing 6 units of output.
3. Identify the total cost of producing 7 units of output.
4. Subtract the total cost of producing 6 units from the total cost of producing 7 units.

The difference you get from step 4 is the marginal cost of producing the seventh unit of output.

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The perimeter of ΔNOP is equal to 25.6 units.

In Mathematics, the basic proportionality theorem states that when any of the two (2) sides of a triangle is intersected by a straight line which is parallel to the third (3rd) side of the triangle, then, the two (2) sides that are intersected would be divided proportionally and in the same ratio.

By applying the basic proportionality theorem to the given triangles, we have the following:

ΔNOP ≅ ΔKLM

OP/ML = x/KL

x = (OP × KL)/ML

x = (8 × 7)/5

x = ON = 11.2 units.

For the perimeter of ΔNOP, we have;

Perimeter of ΔNOP = OP + NP + ON

Perimeter of ΔNOP = 8 + 6.4 + 11.2

Perimeter of ΔNOP = 25.6 units.

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The proof for the given proportion or two equivalent ratios given as (y+x):(y-x) = k:1 is shown below

What is a proportion?

On ratio and fractions, proportion is based. Two ratios are equal when they are represented as a fraction (a/b), a ratio (a:b), and then a proportion. A and B are two integers. Two sets of supplied numbers are said to be directly proportional if they increase or decrease in the same ratio for both sets. The symbols "::" or "=" are used to indicate proportions. If the ratio between the first and second is equal to the ratio between the second and third, then any three quantities are in continuing proportion.

Given that (y+x) : (y-x) = k : 1

We know that product of extremes = product of means

Extremes=(y+x) and 1

Means=(y-x) and k

(y+x) . 1   = (y-x) . k

y + x = ky - kx

y - ky = -kx - x

y - ky = - x(k + 1)

-(y - ky) = x(k + 1)

ky - y = x(k + 1)

y(k - 1) = x(k + 1)

y=[tex]\frac{x(k+1)}{(k-1)}[/tex]

Hence proved.

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Correct expression would be, 5*(6-3)+14=19

What is expression?

An expression consists of one or more numbers or variables along with one more operation.

Given Expression:

         5×6-3+4 = 19

To make expression true we will add parentheses between 6 and 3

The correct expression would be, 5*(6-3)+14=19

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For quadrilateral ABCD x=85 and angle B= 23°.

A quadrilateral is a polygon with four sides and four angles. It is a closed figure and can have different shapes and sizes, depending on the length of its sides and the angles between them.

(a) Supplementary equation used to solve for x:

∠A + ∠C = 180°

(b) All math used to calculate for x:

∠A + ∠C = 180°

(x - 5) + (x + 15) = 180 (substitute the given values for ∠A, ∠C)

2x - 10 = 180

2x = 170

x = 85

(c) Correct value for x:

x = 85

(d) Plugging x into expressions for angles A, C, D:

∠A = x - 5 = 2(85) - 5 = 165

∠C = x + 15 = 85 + 15 = 100

∠D = x - 13 = 85 - 13 = 72

(e) All math used to calculate the measures of angles A, C, D:

∠A + ∠B + ∠C + ∠D = 360° (sum of angles in a quadrilateral)

165 + ∠B + 100 + 72 = 360

∠B = 23

Therefore, the measures of the angles are:

∠A = 165°

∠B = 23°

∠C = 100°

∠D = 72°

(f) All math used to calculate the measure of angle B:

∠B = 360 - ∠A - ∠C - ∠D

∠B = 360 - 165 - 100 - 72

∠B = 23°

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The probability of getting a flush when selecting 5 cards from a standard 52-card deck is about 0.198%.

Hi! To calculate the probability of getting a flush (all 5 cards from the same suit) when selecting 5 cards from a standard 52-card deck, follow these steps:

1. Calculate the total number of ways to choose 5 cards from a 52-card deck. This can be computed using combinations: C(52, 5) = 52! / (5! * (52-5)!), where ! denotes a factorial. C(52, 5) = 2,598,960.

2. Calculate the total number of ways to get a flush. There are 4 suits in a deck, and you need all 5 cards to be from the same suit. For each suit, you can choose 5 cards from the 13 available in that suit: C(13, 5) = 1,287. Since there are 4 suits, the total number of flushes is 4 * C(13, 5) = 4 * 1,287 = 5,148.

3. Compute the probability of getting a flush by dividing the total number of flushes by the total number of ways to choose 5 cards: probability = 5,148 / 2,598,960 = 0.00198, or approximately 0.198%.

So, the probability of getting a flush when selecting 5 cards from a standard 52-card deck is about 0.198%.

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The probability of getting a flush is quite low, but it is still possible.

The probability of getting a flush (all 5 cards from the same suit) if you select 5 cards from a standard 52 card deck can be calculated as follows:

There are 4 suits (clubs, diamonds, hearts, and spades) in a standard deck of cards, each with 13 cards (Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King).

The number of ways to select 5 cards from a deck of 52 cards is given by the combination formula:

[tex]C(52,5) = 52! / (5! \times (52-5)!) = 2,598,960[/tex]

The number of ways to get a flush.

We can choose any one of the 4 suits for our flush, and then we need to select 5 cards from that suit.

C(13,5) ways to select 5 cards from a suit with 13 cards.

So, the total number of ways to get a flush is:

[tex]4 \times C(13,5) = 4 \times (13! / (5! \times (13-5)!)) = 4 \times 1,287 = 5,148[/tex]

The probability of getting a flush when selecting 5 cards from a standard 52 card deck is:

[tex]P = number of ways to get a flush / total number of ways to select 5 cards[/tex]

[tex]P = 5,148 / 2,598,960[/tex]

[tex]P = 0.00198 or approximately 0.2\%[/tex]

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The minimum value,  or lowest value, of the data set is the same value as the leftmost point of the box and whisker plot.

We know that a box-and-whisker plot is nothing but a graph summarising a set of data. This plot shows how the data is distributed. It also shows any outliers.

In box-and-whisker plot, the median is in the middle of the box. The minimum value in the dataset is displayed at the far left end of the plot. The first quartile (Q1 or the 25th percentile) is in between the minimum value and median. The third quartile (Q3 i..e, the 75th percentile) at the right side, between the median and the maximum value. Latsly the maximum value in the dataset is displayed at the far right end of the plot.

Therefore, the minimum value is the same value as the leftmost point of the plot.

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The complete question is:

Holly and Brian’s social studies teacher gives them quizzes worth up to 20 points. Holly received the following scores: 5, 11, 17, 18, and 20. Brian’s scores were 16, 16, 17, 19, and 19

The box-and-whisker plot is shown below. The minimum, or lowest value, of the data set is 2. Move the leftmost blue dot back and forth. How does this relate to the position of the leftmost point of the box-and-whisker plot?

Step-by-step explanation:

Ok do what you need to do is label the line opposite the square angle as H for the hypotenuse. Then label the line opposite the circular angle as O for the opposite. And finally, the last line remaining should be labelled as A for Adjacent. Does this help?

The current outdoor temperature is 37.89°C, which is less than the highest temperature limit, i.e., 47.8°.

Both Celsius and Fahrenheit have different zero points and the temperature increments also vary quite differently. 100 degrees separate freezing and boiling on the Celsius scale, but for Fahrenheit the difference is 180 degrees. This means Celsius is 1.8 times larger than Fahrenheit.

To determine whether the medication has been exposed to temperatures higher than 47.8°C, we need to convert the outdoor temperature from Fahrenheit to Celsius. The conversion formula is:

°C = (°F - 32) x 5/9

Using this formula, we can get the temperature in Celsius form,

°C = (100.2 - 32) x 5/9

   = 37.89°C

Since the outdoor temperature is lower than the maximum temperature the medication can be exposed to, it is safe to assume that the medication has not been exposed to temperatures higher than 47.8°C.

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The value of 'x' evaluated on the basis of angle sum property is 31 & arranged length of sides of given triangle ΔEBD from longest to shortest is DE > BD > BE

What is a triangle?

A triangle is a three-sided polygon with three vertices that is constructed using segments of straight lines. The triangle's angles are created by connecting the three line segments that make up its sides end to end at a single point. Angle sum attribute states that the sum of the triangle's three angles is 180 degrees. Triangle inequality asserts that the third side is greater than or equal to the sum of any two triangle sides.

Given that

∠ABC=(4x)°

∠BED=(5+x)°

∠BDF=160°

a)Find 'x'

consider ΔBED,

∠ABC=∠EBD {vertically opposite angles}

∴∠EBD=(4x)°

∠BDF+∠BDE=180° {angles on straight line}

∠BDE=180-160

∠BDE=20°

We know that ∠EBD+∠BDE+∠DEB=180° {angle sum property}

4x + 20 + (5+x)=180°

4x + 20 + 5 + x = 180°

5x + 25 = 180°

5x = 180 - 25

5x = 155

x = 31

b)Arrangement of sides from the longest to the shortest:

Based on the value of 'x', the angles of triangle ΔEBD:

∠EBD=4x=4 . 31 = 124°

∠BED=5 + x= 5 + 31 = 36°

∠BDE=20°

We know that the side opposite to the larger angle is the longest and that of the  least angle is the shortest.

∴Side opposite to the largest angle ∠EBD=124° is DE

side opposite to the least angle ∠BDE=20° is BE

∴Descending order of sides of ΔEBD is DE > BD > BE

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The length of the arc on a circle with the radius of 2. 4 km and is intercepted by a central angle measuring 150° is 2π km.

The length of an arc on a circle with radius "r" intercepted by a central angle of "θ" degrees is given by the formula:

L = (θ/360) * 2πr

In this case, the radius is 2.4 km and the central angle is 150 degrees, so we have to put the values in the formula above to find the answer:

L = (θ/360) * 2πr

L = (150/360) * 2π(2.4)

L = (5/12) * 4.8π

L = 2π

Therefore, the length of the arc is 2π km (or approximately 6.28 km) when rounded to two decimal places.

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The distance travelled  in 4 seconds while driving at a constant speed of 50 mph is equal to 0.0556 miles (approximately).

Driving speed is equal to 50mph

And driving at a constant speed of 50 miles per hour ,

Then your speed in miles per second is ,

Since there are 60 minutes in an hour

⇒50 mph = 50/60 miles per minute

⇒50/60 miles per minute = 5/6 miles per minute

Since there are 60 seconds in a minute

⇒ 5/6 miles per minute = 5/360 miles per second

⇒ 5/360 miles per second = 0.0138888... miles per second

⇒ 5/360 miles per second  ≈0.0139 miles per second

When look down for 4 seconds while driving at 50 mph,

Travel a distance of,

distance = speed x time

Substitute the value we get,

⇒ distance = 0.0139 miles per second x 4 seconds

⇒ distance ≈ 0.0556 miles

Therefore,  travel a distance of  0.0556 miles approximately in 4 seconds while driving at a constant speed of 50 mph.

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The researcher should consider the following steps when creating the two groups: Random assignment, Pairing students with similar abilities, Controlling for potential confounding variables,

Collecting data and analyzing results.
Random assignment:

To minimize any potential bias, the researcher should randomly assign one student from each pair to receive extra homework problems while the other does not.
Pairing students with similar abilities:

In order to make a valid comparison, the researcher should pair students with similar algebra skills or previous performance in the subject.

This way, any observed differences in the test results are more likely to be due to the extra homework rather than differences in ability.
Controlling for potential confounding variables:

The researcher should control for any other factors that could influence students' algebra test results, such as attendance, study habits, and teacher quality.

After the two-week period, the researcher should collect the test scores of both groups and compare their performance.

This can be done using statistical methods, such as a paired t-test, to determine if there is a significant difference between the groups.

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Therefore, the range is 172 points and the interquartile range is 42 points. Therefore, the range without the outlier is 140 points and the interquartile range without the outlier is 40 points.

In statistics, the range is the difference between the largest and smallest values in a dataset. It is a measure of dispersion that indicates the spread of the data. The range provides a quick and simple way to get an idea of the variability of the data, but it can be affected by outliers and is therefore not always a reliable measure of dispersion. To calculate the range, you simply subtract the smallest value from the largest value in the dataset.

Here,

a. To find the range, we subtract the smallest value from the largest value:

Range = 193 - 21 = 172

To find the interquartile range, we first need to find the first and third quartiles.

Arrange the data in order from smallest to largest:

21, 53, 74, 82, 84, 103, 108, 116, 122, 193

Find the median (middle value) of the lower half of the data (Q1):

Q1 = median(21, 53, 74, 82, 84) = 74

Find the median (middle value) of the upper half of the data (Q3):

Q3 = median(103, 108, 116, 122, 193) = 116

Subtract Q1 from Q3 to get the interquartile range:

IQR = Q3 - Q1 = 116 - 74 = 42

b. To identify the outlier(s), we can use the rule that any value less than Q1 - 1.5 x IQR or greater than Q3 + 1.5 x IQR is considered an outlier.

Q1 - 1.5 x IQR = 74 - 1.5 x 42 = 11

Q3 + 1.5 x IQR = 116 + 1.5 x 42 = 181

The value 21 is less than the lower bound of 11, so it is an outlier.

To find the range and interquartile range without the outlier, we need to remove it from the data set:

74 82 84 122 193 53 103 108 116

The range without the outlier is:

193 - 53 = 140

To find the interquartile range without the outlier, we need to find the first and third quartiles of the new data set:

Q1 = median(53, 74, 82, 84, 108) = 82

Q3 = median(116, 122, 193) = 122

IQR = Q3 - Q1 = 122 - 82 = 40

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The endpoints of the rainbow are 2√60 cm apart.

The given equation for the rainbow is in vertex form, which is y = a(x - h)^2 + k, where (h, k) is the vertex of the parabola.

In this case, the vertex is (1, 6), which means that the parabola is shifted horizontally by 1 unit to the right and vertically by 6 units upwards from the standard parabola y = ax^2.

Since the height of the rainbow is 6 cm, this means that the highest point of the parabola is at y = 6, which occurs at the vertex (1, 6).

To find the distance between the endpoints of the rainbow, we need to find the x-intercepts of the parabola. These occur where y = 0. Therefore, we need to solve for x in the equation:

0 = -0.1(x - 1)^2 + 6

-6 = -0.1(x - 1)^2

-6/-0.1 = (x - 1)^2

60 = (x - 1)^2

±√60 = x - 1

x = 1 ± √60

Since we are looking for the distance between the endpoints, we need to subtract the smaller x-value from the larger one:

Distance between endpoints = (1 + √60) - (1 - √60)

Distance between endpoints = 2√60

Therefore, the endpoints of the rainbow are 2√60 cm apart.

The given equation in the question is wrong, the correct equation is:

y = -0.1(x - 1)^2 + 6.

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Probability about at least one customer arrives at the shop while a one-minute interval is almost 0.632 or 63.2%.

The probability that at least one customer arrives at the shop during a one-minute interval can be calculated using the Poisson distribution, which is commonly used to model the arrival of events over a given time period.

Let's assume that the average number of customers arriving at the shop per minute is [tex]l[/tex]. Poisson probability mass function is;

[tex]P(X = k) = (e^{-l} * l^k) / k![/tex]

where X is the random variable representing the number of customers arriving in a one-minute interval, and k is the number of customers that arrive.

To find the probability of at least one customer arriving, we need to calculate the probability of X being greater than or equal to 1. That is,

[tex]P(X > = 1) = 1 - P(X = 0)[/tex]

When [tex]l[/tex] is relatively small, we can use approximation:

[tex]P(X = 0) = e^{-l[/tex]

Therefore,

[tex]P(X > = 1) = 1 - P(X = 0)[/tex]

[tex]≈ 1 - e^{-l[/tex]

We don't have the value of [tex]l[/tex], but assuming an average arrival rate of 1 customer per minute (i.e., [tex]l[/tex] = 1), we get:

[tex]P(X > = 1) = 1 - e^{-1[/tex]

≈ 0.632

Therefore, the probability about  at least one customer arrives at the shop while a one-minute interval is almost 0.632 or 63.2%.

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The distance between two opposite corners of the floor is 5 meters.

What is Pythagoras Theorem?

Pythagoras' theorem is a fundamental principle in geometry that states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.

Using the Pythagorean theorem, the distance between two opposite corners of the floor can be found by calculating the length of the hypotenuse of a right triangle whose legs are the length and width of the floor. Therefore,

c² = a² + b²

where c is the length of the hypotenuse, a is the length of the floor (3 meters), and b is the width of the floor (4 meters).

Substituting the values, we get:

c² = 3² + 4²

c² = 9 + 16

c² = 25

Taking the square root of both sides, we get:

c = √(25)

c = 5

Therefore, the distance between two opposite corners of the floor is 5 meters.

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Answer:

it A or B

Step-by-step explanation:

the other two C and D dont make sense to what the question is asking

The probability the coin lands heads on a single toss is 0.625

Let's assume that the probability of getting heads on a single toss is denoted by p.

The probability of getting 2 heads out of 7 tosses is given by the binomial distribution

P(2 heads) = (7 choose 2) × p^2 × (1-p)^5

Similarly, the probability of getting 3 heads out of 7 tosses is

P(3 heads) = (7 choose 3) × p^3 × (1-p)^4

We are given that P(2 heads) = P(3 heads), so we can set these two equations equal to each other:

(7 choose 2) × p^2 × (1-p)^5 = (7 choose 3) × p^3 × (1-p)^4

Simplifying this equation, we get

21 × p^2 × (1-p)^5 = 35 × p^3 × (1-p)^4

Dividing both sides by p^2 * (1-p)^4, we get

21/(1-p) = 35/p

Solving for p, we get:

p = 35/(21+35) = 35/56 = 0.625

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(a) The linear density (mass/length) rho has SI units of kg/m. Since rho = a + bx, the SI units of a must be kg/m and the SI units of b must be kg/m^2.
(b) To find the mass of the rod, we need to integrate the linear density function over the length of the rod:
m = ∫₀ᴸ ρ(x) dx
Substituting in ρ(x) = a + bx:
m = ∫₀ᴸ (a + bx) dx
m = [ax + (1/2)bx²] from 0 to L
m = aL + (1/2)bL²
Therefore, the mass of the rod in terms of a, b, and L is m = aL + (1/2)bL².

(a) In this problem, rho (ρ) represents linear density, which has units of mass per length. In SI units, mass is measured in kilograms (kg) and length in meters (m). Therefore, the units of linear density are kg/m. Since ρ = a + bx, the units of a and b must be consistent with this equation. The units of a are the same as those of ρ, so a has units of kg/m. For b, since it is multiplied by x (which has units of meters), b must have units of kg/m² to maintain consistency in the equation.

(b) To find the mass of the rod, we need to integrate the linear density function over the length of the rod (from x=0 to x=L). Let's set up the integral:

Mass (M) = ∫(a + bx) dx, with limits from 0 to L

Now, we can integrate:

M = [a * x + (b/2) * x²] evaluated from 0 to L

Substitute the limits:

M = a * L + (b/2) * L²

So, the mass of the rod in terms of a, b, and L is:

M = aL + (bL²)/2

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The equivalent sum to the given equation is -9c - 20.

An algebraic expression is consists of variables, numbers with various mathematical operations.

Equivalent sums refers to addition or subtraction from the other number to maintain the same total value.

= 9c-12-15c-8-3c

To find the equivalent sum, first we can simplify this expression by first combining like terms:

= 9c - 15c - 3c - 12 - 8

= (9c - 15c - 3c) - (12 + 8)   (grouping the like terms)

Solving the expression for terms c and  for constant terms,

= -9c - 20

Therefore, the equivalent sum is -9c - 20.

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