1.
If
y
varies directly as the cube of
x
and
y
= 30 when
x
= 2, find
x
when
y
= 468.75.
A.
9
B.
7
C.
5
D.
3
Hint
2.
Use
y
=
to find the value of
y
when
x
= 14.
A.
28
B.
56
C.
98
D.
8
Hint
3.
If
y
varies inversely as the cube of
x
and
y
= 8 when
x
= 2, find
x
when
y
= 1.
A.
x
= 1
B.
x
= 4
C.
x
= 8
D.
x
= 2
Hint
4.
If
y
varies jointly as
x
and the cube root of
z
,
and
y
= 30 when
x
= -5
and
z
= 27, find y when
z
= -8 and
x
= 0.5.
A.
y
= -2
B.
y
= 4
C.
y
= 20
D.
y
= 2
Hint
5.
Which best describes this graph?
A.
direct variation
B.
none of these
C.
joint variation
D.
inverse variation
Hint