On paper, sketch the solid obtained by rotating the region bounded by y=x7y=x7, x=1x=1, and y=−1y=−1 around the axis y=−1y=−1. using the sketch, write a riemann sum approximating the solid

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?