Please help me with the steps to work this problem. A tray of lasagna and a pie are taken out of the oven at the same time, at a temperature of 375 degrees F. As they cool off, their temperatures are given by exponential functions of time. After 5 minutes, the pies temperature is 300 degrees F. At 20 minutes after they were taken out of the oven, the lasagna is warmer than the pie by 100 degrees F.
a) compute an exponential function P(t) for the temperature of the pie at t minutes after it was taken out of the oven.