Since it involves an integral, we can assume that it's going to involve f prime somehow, especially since they've given us so much information about f prime, including its graph, and the area under or above the curve at different intervals. And then they want us to find f of four and f of negative two. So let's think about how we can connect, how we can connect f prime and integral and f of x. Well, if we took the integral from a to b of f prime of x dx, what is this going to be equal to? Well, this is going to be equal to the antiderivative of f prime of x, which is f of x, and you're going to evaluate that at b and a and subtract the difference. So this is going to be f of b minus f of a. This is straight out of the fundamental theorem of calculus.