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Mathematics
Problem
Which of the following expressions represents the radius of a typical washer formed when the region bounded by
y
=
x
y = \sqrt{x}
y
=
x
and the
x
x
x
-axis is revolved about the
x
x
x
-axis for
0
≤
x
≤
9
0 \le x \le 9
0
≤
x
≤
9
? a)
R
(
x
)
=
x
R(x)=x
R
(
x
)
=
x
b)
R
(
x
)
=
9
−
x
R(x)=9-\sqrt{x}
R
(
x
)
=
9
−
x
c)
R
(
x
)
=
x
R(x)=\sqrt{x}
R
(
x
)
=
x
d)
R
(
x
)
=
3
R(x)=3
R
(
x
)
=
3
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