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The only problem with the answer above is when he substituted 375 for F(o) when it should be 350 instead, which will give F0=75, so your equation will be 275e^-.4t +75

step 1: set up implicit integration

dF/dt = -110e^(-.4t)

dF = -110e^(-.4t)dt

step 2: integrate both sides

F(t) = 275e^(-.4t) + C

step 3:

you've got your general equation, now transform it so that 75 deg is the horizontal asymptote

F(t) = 275e^(-.4t) + C

step 4: evaluate at t=5

F(5) = 275e^(-.4t) + C

F(5) = 112.21 degrees

Colleen's response has a mistake. F(0), the starting temperature of the pizza, is 350, not 375. This makes the constant F0 equal to 75, and your answer becomes approximately 112 degrees.

This is incorrect, the answer is 112 degrees Fahrenheit

Calculus

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