1.

Find the (implicit) solution to the separable equation

3.

A pan of water with an initial temperature of 70^°F is placed in a freezer which is maintained at a constant temperature of 20^°F. 10 minutes later, the water in the pan has reached a temperature of 50^°F. How long does it take for the water to reach 35^°F?

4.

Solve the initial value problem

From the textbook:

p.23: 2,10,17,18

p.30: 8,12

p.38: 4,8,14

p.45: 6,10,11

p.54: 2,15,20,27

p.69: 2,11,12

p.422: 1,3,4,5 (but the exam problem won't be nearly as long...)