8th Grade Math Assessment: 8.F

Question 1 of 5

1. Question

The table below shows the cost of different numbers of goldfish at a pet store.

The cost is a linear function of the number of goldfish. Which statement describes the rate of change of this function?

The cost increases $0.30 each time 1 goldfish is added.
The cost increases $1.50 each time 1 goldfish is added.
The cost increases $3.00 each time 5 goldfish are added.
The cost increases $6.00 each time 5 goldfish are added.

Question 2 of 5

2. Question

The four tables below show relationships in which the x values represent inputs and the y values represent the corresponding outputs.

Which table represents a relationship that is not a function?

Q
R
S
T

Question 3 of 5

3. Question

A bicycle club went on a six-hour ride. The graph below shows the relationship between the number of hours spent on the trails and the number of miles traveled.

Which statement best interprets information provided by the graph?

The club members rode at a constant speed for the entire ride.
The club members stopped for a rest during their ride.
The number of miles traveled increased continuously throughout the ride.
The number of miles traveled increased some of the time and decreased some of
the time.

Question 4 of 5

4. Question

The table below represents a linear function.

Which function has a greater slope and a greater y-intercept than the linear function
represented in the table?

y = 2x + 8.5
y = 3x + 7.5
y = 5x + 6.5
y = 10x + 5.5

Question 5 of 5

5. Question

Which phrase describes a nonlinear function?

the area of a circle as a function of the radius
the perimeter of a square as a function of the side length
the cost of gasoline as a function of the number of gallons purchased
the distance traveled by a car moving at constant speed as a function of time