Using correct units, explain the meaning of the expression in the context of this problem. So we know that if we just want to evaluate this definite integral from zero to 10 of h prime of t dt, this is just the same thing as evaluating the antiderivative of this thing right over here, which is just h of t at 10, and subtract from that the antiderivative of this evaluated at zero. This is the second fundamental theorem of calculus. This is exactly how we evaluate definite integrals. And when you look at it from this, you just see that it's, when you evaluate it, it just gives us the difference in temperature from zero minutes to 10 minutes. We're taking the temperature at 10 minutes, and from that we're subtracting from that the temperature at zero minutes. So this is really our change in temperature over the first, over those 10 minutes.