## Precalculus (10th Edition)

$38$
If we approximate the area using the right endpoints, then: $A=(2-0)f(2)+(4-2)f(4)+(6-4)f(6)+(8-6)f(8)\\=2f(2)+2f(4)+2f(6)+2f(8)\\=2(5)+2(7)+2(5)+2(1)=38$