A researcher wanted to know if there is an association between exercise and sleep for the population of 16-year-olds in the United States. She obtained survey responses from a random sample of 2000 United States 16-year-olds and found convincing evidence of a positive association between exercise and sleep. Which of the following conclusions is well supported by the data?

There is a positive association between exercise and sleep for 16-year-olds in the United States.

There is a positive association between exercise and sleep for 16-year-olds in the world

Using exercise and sleep as defined by the study, an increase in sleep is caused by an increase of exercise for 16-year-olds in the United States.

Using exercise and sleep as defined by the study, an increase in sleep is caused by an increase of exercise for 16-year-olds in the world.

4. Kathy is a repair technician for a phone company. Each week, she receives a batch of phones that need repairs. The number of phones that she has left to fix at the end of each day can be estimated with the equation P d = 108 − 23 , where P is the number of phones left and d is the number of days she has worked that week. What is the meaning of the value 108 in this equation?

C) Kathy repairs phones at a rate of 108 per hour.

A) Kathy will complete the repairs within 108 days.

B) Kathy starts each week with 108 phones to fix.

D) Kathy repairs phones at a rate of 108 per day.

A landscaping company estimates the price of a job, in dollars, using the expression 60 + 12nh, where n is the number of landscapers who will be working and h is the total number of hours the job will take using n landscapers. Which of the following is the best interpretation of the number 12 in the expression?

A) The company charges $12 per hour for each landscaper.

B) A minimum of 12 landscapers will work on each job.

C) The price of every job increases by $12 every hour.

D) Each landscaper works 12 hours a day

What is the definition of a coefficient?

The number in front of a variable

The letter used to represent a quantity

The little number or letter used to raise to a power

The number in back of a variable

4. Kathy is a repair technician for a phone company. Each week, she receives a batch of phones that need repairs. The number of phones that she has left to fix at the end of each day can be estimated with the equation P d = 108 − 23 , where P is the number of phones left and d is the number of days she has worked that week. What is the meaning of the value 108 in this equation?

B) Kathy starts each week with 108 phones to fix.

A) Kathy will complete the repairs within 108 days.

C) Kathy repairs phones at a rate of 108 per hour.

D) Kathy repairs phones at a rate of 108 per day.

SAT Math Practice

Authored by Paige Dawson

Mathematics

9th - 12th Grade

CCSS covered

Used 35+ times

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