The distance s, in m, above the ground for a projectile fired vertically upward with a velocity of 80 m/sec as a function of time, in s, is given by s = 80t - 5t2. Find t for v = 0. Round your answer to the nearest tenth of a second.

The resistance of a copper wire carrying an electrical current is directly proportional to its length and inversely proportional to its cross-sectional area. A copper wire with a diameter of 0.0126inch has a resistance of 64.9ohms per thousand feet. What length of 0.0201-inch-diameter copper wire will produce a resistance of 33.5ohms?

Find the unknown value. 27. y varies jointly with x and the cube root of 2. If when x=2 and z=27,y=12, find y if x=5 and z=8.

Change the function y=3(0.5)x to one having e as the base.