And x squared divided by x to the third, well that is going to be one over x. So plus one over x dx. Now this is going to be equal to, let's take the antiderivative of the different parts, and we're going to evaluate that at four, and we're going to evaluate that at two. And we're going to find the difference between this expression, the antiderivative evaluated at four and at two. Now what is the antiderivative of six x to the negative three? Well here once again we can just use, we could use as a power rule for taking the antiderivative, or it's the reverse of the derivative power rule. We know that if we're taking the integral of x to the n dx, the antiderivative of that is going to be x to the n plus one over n plus one.