Functions Unit Review Practice

Question

Connections Academy 8th Grade
Please only use this to check your answers.

1. Find the next three terms in the sequence.
3, 12, 21, 30...

A. 40, 50, 60
B. 38, 46, 54
C. 39, 48, 57 ***
D. 36, 32, 39

2. Identify the sequence as arithmetic, geometric, or neither.
1.6, 0.8, 0.4, 0.2,...

A. arithmetic
B. geometric ***
C. neither

3. 5 • 3n

A. 15, 30, 45, 60
B. 5, 15, 45, 135
C. 0, 15, 45, 135
D. 15, 45, 135, 405 ***

4. Use the funciton rule f(x) = x • |-1|x. Find the output f(2)

A. 4
B. 3
C. -2
D. 2 ***

5. 3x + y = 2

A.
B.
C.
D. ***

6. Do the data in the table represent a linear function? If so write a rule for the function.
x|-2|-1| 0| 1| 2|
y|-7| 1| 8|17|25|

A. yes;y = 8x + 9
B. yes;y = 8x + 8
C. yes;y = 1/8x + 8
D. no ***

7. Use the slope and two points to write a linear function rule for the graph.

A. y= -2x - 6
B. y= 2x - 6 ***
C. y= 1/2x - 6
D. y= 1/2x + 6

Answer 1

8. Which of the following expressions represents a quadratic function?

A. y = 4x - 2
B. y = 3x^2 + 2x + 1 ***
C. y = 2x + 3
D. y = 5 - 2x

9. Identify the vertex of the parabola defined by the function f(x) = -2(x-3)^2 - 5

A. (3,-5) ***
B. (-3,5)
C. (2,-5)
D. (-2,5)

10. Solve the following system of equations by graphing:
2x + y = 5
x - y = 3

A. (2,1)
B. (-1,2)
C. (1,2)
D. (2,-1) ***