In each of 1 through 5, test the differential equation for exactness. If it is exact (on some region of the plane), find a potential function and the general solution (perhaps implicitly defined). If it is not exact anywhere, do not attempt a solution.4x y + 2x + (2x 2 + 3y2 )y= 0

Calculus notes of 9/26/16 3.11 Related Rates Suppose a spherical weather balloon is filled with gas at a rate of 150 ft /min. What is the rate of change of its radius when the radius is 20 ft We are given / = 150: Volume increases by 150 ft /min. 3 dt dr We want / whedtr = 20 We need an equation relating...