1.
Choose the relation that is a function.
A.
B.
C.
D.
Hint
2.
Determine which equation represents a function.
A.
x
= 4
B.
x
=
y
2
- 1
C.
D.
y
= -2
x
+ 1
Hint
3.
In a science experiment, students hung a cup from a spring and measured the length of the spring when candies were added to it. Their data are shown in the table below. Which statement is true?
A.
The relation is a function because for each
x
value, there is exactly one
y
value.
B.
The relation is not a function because there are two
y
values for some
x
values.
C.
The relation is a function because the range values increase.
D.
The relation is not a function because only a line can be a function.
Hint
4.
Given the function
f
(
x
) =
x
2
+ 9, find
f
(-3).
A.
0
B.
12
C.
6
D.
18
Hint
5.
The temperature
f
(
x
) of water in a lake in degrees Fahrenheit is estimated by the function shown below, where
x
is the depth in feet of the water. What would be the temperature of water 30 feet below the surface?
A.
33°F
B.
63°F
C.
111°F
D.
71.25°F
Hint