So they gave us a differential equation. They want us to find an expression for G of T, so essentially find a solution to this differential equation, and then they want us to use that solution to find the internal temperature at time T equals three. So the first thing to appreciate, this is in an AP calculus class, and so if they're asking us to solve a differential equation or find a solution to a differential equation, it is unlikely to be a really strange differential equation. It's likely to be a separable differential equation, and then once we find that solution, we just have to evaluate it at time T is equal to three. So let's rewrite the differential equation, and then let's try to evaluate. Let's see if we can find a solution, and then we'll evaluate. The derivative of G with respect to T is equal to the negative of G minus 27 to the 2 3rds power.