Chapter 3

The student council is selling candy bars to earn money towards their budget for the school dance. Identify the independent and dependent variables.

• I: student council;

  D: money earned

• I: candy bars sold;

  D: money earned

• I:budget;

  D:school dance

• I:candy bars sold;

  D:school dance

Dion owns a delivery service. He charges his customers $15.00 for each delivery. His expenses include $7000 for the motorcycle he drives and $0.42 for gasoline per trip. Which equation could Dion use to calculate his profit p for d deliveries?

• p = 15 – 0.42d

• p = 7000 + 15d

• p = 14.58d – 7000

• p = 0.42d + 7000

• -7

• -4

• 63

• 4761

Jim’s new car has 150 miles on the odometer. He takes a trip and drives an average of m miles each day for three weeks. Which expression represents the mileage on Jim’s car after his trip?

• 150m + 3

• 150 + 3m

• 150m + 21

• 150m + 21m

Translate the sentence into an equation.

Five times the sum of m and t is as much as four times r.

• 5m + t = 4

• 5m + t = r

• 5(m + t) = 4r

• m + t = 5(4r)

Solve 8(x – 5) = 12(4x – 1) + 12.

• -7/10

• -5/7

• -2

• -1

Paul and Charlene are 420 miles apart. They start toward each other with Paul driving 16 miles per hour faster than Charlene. They meet in 5 hours. Find Charlene’s speed.

• 34 mph

• 50 mph

• 40.3 mph

• 68.0 mph

Determine which equation is a linear equation.

• 
• 
• 
• 

If f(x) = 7 – 2x, find f(3) .

• 11

• 1

• 7

• -11

Chapa is beginning an exercise program that calls for 30 push-ups each day for the first week. Each week thereafter, she has to increase her push-ups by 2. Which week of her program will be the first one in which she will do 50 push-ups a day?

• 9th week

• 10th week

• 11th week

• 12th week