AP Calculus ABhardmcq1 pt

The base of a solid is the region in the first quadrant bounded by the graph of y=x2y=x^2, the xx-axis, and the line x=2x=2. Cross sections perpendicular to the xx-axis are isosceles right triangles with one leg in the base. What is the volume of the solid?

A.325\frac{32}{5}
B.85\frac{8}{5}
C.165\frac{16}{5}
D.83\frac{8}{3}

Explanation

Core Concept

Each triangle has leg x2x^2, so its area is 12x4\frac{1}{2}x^4. The volume is 02x42dx=[x510]02=165\int_0^2\frac{x^4}{2}\,dx=[\frac{x^5}{10}]_0^2=\frac{16}{5}.

Correct Answer

C165\frac{16}{5}

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