Mathematics

Problem

The region in the first quadrant bounded by

y = x^{2}

and

y = 4

is revolved about the

y

-axis. Which expression correctly represents the outer radius

R(y)

of a typical washer in terms of

y

? a)

R(y)=2

R(y)=\sqrt{y}

R(y)=y^{2}

R(y)=4