Evaluating Functions and Interpreting Graphs for 8th Grade

1. A function f(x) = 3x + 2 represents the cost in dollars of x items. What is the cost of 5 items?

• 15

• 10

• 17

• 20

2. The function g(t) = t^2 - 4t models the height of a ball in meters after t seconds. What is the height of the ball after 3 seconds?

• 0 meters

• 5 meters

• -1 meter

• -3 meters

3. A function h(d) = 2d + 10 describes the distance in miles d traveled by a car after a certain time. How far has the car traveled after 4 hours?

• 10 miles

• 18 miles

• 20 miles

• 15 miles

4. The function p(n) = 5n - 3 represents the number of pages read after n hours. How many pages are read after 6 hours?

• 30

• 15

• 18

• 27

5. A graph shows the function q(x) = -x + 8. What is the value of q(2) based on the graph?

• 4

• 10

• 0

• 6

6. The function r(m) = 4m + 1 represents the number of tickets sold m days after a concert announcement. How many tickets are sold after 5 days?

• 21

• 10

• 15

• 30

7. A function s(x) = x/2 + 3 models the temperature in degrees Celsius x hours after sunrise. What is the temperature 6 hours after sunrise?

• 4 degrees Celsius

• 8 degrees Celsius

• 6 degrees Celsius

• 10 degrees Celsius

8. The function t(v) = 2v^2 - 5 models the profit in dollars from selling v items. What is the profit from selling 4 items?

• 40

• 27

• 10

• 15

9. A graph of the function u(x) = 3x - 1 shows the relationship between hours worked and money earned. How much money is earned after working 5 hours?

• 14

• 10

• 20

• 5

10. The function v(a) = 10 - a^2 represents the remaining amount of water in a tank after a days. How much water is left after 2 days?

• 6

• 2

• 8

• 4