Interpreting Linear Functions

Consider the function f(x)=9x+5.  Find f(7).

• 102

• 68

• 7

• 21

Consider the function k(x)=x/5-3.  Find k(-20).

• -20

• 1

• -7

• -1

Consider the function t(x)=x/8+2x.  Find t(16).

• 34

• 160

• 16

• 56

A company is selling bubble gum.  The function g(x)=3x+4 tells the company how much to charge if someone buys x packages of bubble gum.  Find g(8) and tell what it means within the context of the problem.

• g(8)=8.  This means that after 8 packages of gum, the company makes $8.

• g(8)=42.  This means that 8 packages of gum costs $42.

• g(8)=28.  This means that 8 packages of gum costs $28.

• g(8)=24.  This means that 8 packages of gum costs $24.

The population of the town is given by the function y = 60,000 - 500x, where y is the number of inhabitants and x is the time in years. What is the population of the town after 9 years?

• 55,500

• 55,000

• 54,500

• D:54,000

The change in temperature is given by the function y = 68 - x, where y is the temperature in Fahrenheit degrees and x is the time in hours. What is the temperature after 2 hours?

• 70

• 69

• 67

• 66

The profit of a company is given by the function y = 100,000 - 2,000x, where y is the profit in dollars and x is the time in months. What is the profit of a company after 5 months?

• $98,000

• $90,000

• $89,000

• $80,000

If I join the gym for a start up fee of $40 and monthly fee of $10, what equation models this?

• y = 10x - 40

• y = 40x + 10

• y = 10x + 40

• y = 40x - 10

The amusement park charges $20 to get in plus $1.50 per ride. Which linear equation below represents this relationship.

• y=1.5+20x

• y=1.5x + 20

• y = 20x + 1.5

• y= 21.5x

What does the y-intercept mean in this situation?

• The starting price of the pool pass is $0.

• The starting price of the pool pass is $12

• You can buy 6 passes.

• The starting prices of the pool pass is $6.