1.
The graph of
y
= -4
x
2
- 1 is _____.
A.
a straight line
B.
None of these is correct.
C.
a circle
D.
a parabola
Hint
2.
What is true about the graphs of
y
= 2
x
2
and
y
= -2
x
2
?
A.
y
= 2
x
2
opens to the left and
y
= -2
x
2
opens to the right.
B.
y
= 2
x
2
opens downward and
y
= -2
x
2
opens upward.
C.
y
= 2
x
2
opens upward and
y
= -2
x
2
opens downward.
D.
y
= 2
x
2
opens to the right and
y
= -2
x
2
opens to the left.
Hint
3.
The flight of a baseball thrown by a player is modeled by the equation
h
= -16
t
2 + 50
t
+ 6, where
h
is the height in feet and
t
is the time in seconds after the ball is thrown. How high is the ball 2.5 seconds after it is thrown?
A.
42 feet
B.
45 feet
C.
31 feet
D.
37.5 feet
Hint
4.
The ordered pair (-2, -13) is on the graph of which equation?
A.
B.
C.
D.
Hint
5.
What is the value of
y
in the equation
if
x
= -5?
A.
8
B.
17
C.
3
D.
-2
Hint