The antiderivative of this 3 halves times 2 thirds is 1. Decrement the 3 halves, you get x to the 1 half. Now let's take the antiderivative of 1. That's just going to be equal to x. We're going to evaluate this from 1 to 4. We're in the home stretch. This is going to be equal to pi times, first let's do it at 4.