Day 79 - 8.PFA.3 Quiz: Independent & Dependent Variables

The Henderson dairy farm produces milk and other dairy products. The number of cows on the farm changes from month to month. The amount of milk the farm is able to produce in a month depends on the number of cows on the farm.

m = the amount of milk produced by the farm in a month

c = the number of cows on the farm

CHOOSE 2 ANSWERS.

• m is the independent variable

• c is the independent variable

• m is the dependent variable

• c is the dependent variable

Every day at lunch, Marcia swims laps in the pool for one hour. The faster her speed, the more laps she is able to swim in the hour.

s = the speed at which Marcia swims

l = the number of laps Marcia is able to swim

CHOOSE 2 ANSWERS.

• s is the independent variable

• l is the independent variable

• s is the dependent variable

• l is the dependent variable

Joseph is wrapping gifts to earn money for camp. He calculates the amount of wrapping paper he needs based on the number of gifts.

r = the number of rolls of wrapping paper

g = the number of gifts

CHOOSE 2 ANSWERS.

• g is the independent variable

• r is the independent variable

• g is the dependent variable

• r is the dependent variable

Students at the Randall High School homecoming dance always get their pictures taken. The number of pictures the photographer will take is determined by how many students are attending the dance.

p = the number of pictures taken by the photographer

s = the number of students attending the dance

CHOOSE 2 ANSWERS.

• s is the independent variable

• p is the independent variable

• s is the dependent variable

• p is the dependent variable

In order to earn extra money on the weekends, Charlie's string quartet performs at wedding receptions. The amount of money they earn depends on the length of the reception.

m = the amount of money they earn

r = the length of the reception

CHOOSE 2 ANSWERS.

• m is the independent variable

• r is the independent variable

• m is the dependent variable

• r is the dependent variable

On a game show, contestants win money for each question they answer correctly. The number of correct answers dictates the amount of prize money they get.

c = the number of correct answers

m = the amount of prize money

Which variable is the dependent variable?

• c is the dependent variable

• m is the dependent variable

A wind farm in California produces much of its output during the summer when the winds are fastest. The amount of power produced depends on the average wind speed.

p = the amount of power produced

m = the average wind speed

Which variable is the independent variable?

• p is the independent variable

• m is the independent variable

Mary hired a cleaning service to clean her house. To find C, the total cost of cleaning her house, she used the following formula:

C = 7.5x + 25

What is the dependent variable in the formula?

• 25

• x

• 7.25

• C

The formula shows that y depends on x.

y = 2x

What is the independent variable in the formula?

• x

• =

• y

• 2

You are buying cookies at a bakery. Each box of cookies costs $4. The relationship between c, the number of boxes of cookies you buy, and d, how much the cookies will cost you, is shown in the equation.

d = 4c

Choose all statements that apply.

• The dependent variable is the number of boxes of cookies you buy.

• The independent variable is the number of boxes of cookies you buy.

• The dependent variable is the amount of money you spend on the cookies.

• The independent variable is the amount of money you spend on the cookies.