Constructing Functions (8.F.4)

Mike is buying a large pizza. The pizza costs $8.00 plus $0.50 for each additional topping. Which function correctly models this situtation?

• y=8x+.50

• y=.50x+8

• y=8x-.50

• y=8.50x

Bob the plumber charges $15 per hour plus a service fee of $40 for coming out to your house. Which function models this situation?

• y=15x+40

• y=40x+15

• y=15x-40

• y=15x

Bob the plumber charges $15 per hour plus a service fee of $40 for coming out to your house. How much would plumber Bob charge for working 5 hours?

• $115

• $125

• $100

• $75

Valerie is traveling at a rate of 65mph. Which function would be used to model the situation?

• y=65x

• y=x+65

• y=65

• y=x

Thomas got a speeding ticket. The cop said he had to pay $10 for each mile per hour he was going over the speed limit. Thomas also has to pay $115 in court costs. Which equation correctly models what Thomas would have to pay?

• y=125x

• y=10x+115

• y=10x-115

• y=115x+10

A business purchases a computer for $1500. The computer decreases in value $200 each year when the new model is released. Which function models the situation?

• y=200x+1500

• y=1500x-200

• y=-200x+1500

• y=200x-1500

A business purchases a computer for $1500. The computer decreases in value $200 each year. How much is the computer worth after 4 years?

• $700

• $150

• $0

• $1300

There were approximately 11,000 students enrolled at Western Carolina last year. If this figure increases by about 225 students each year, how many years will it take the enrollment to reach 20,000 students?

• 1 year

• 20 years

• 40 years

• 15500 years