If anyone can help me with the answers and work to these problems that would be great.

1. The surface area of a balloon for a parade is increasing at a constant rate of 10.8 square yards per second. Find the rate of change of the volume of the balloon when the diameter is 350 feet

2. Sand pouring from a chute forms a conical pile whose height is always equal to twice the diameter. If the height increases at a constant rate of 8 feet per minute what rate is the sand pouring from the chute when the pile is 50 feet high.

3. Find the area of the region bound by the following graph

f(x)= -x^2+4x+2

g(x)= x+2

Thanks in advance