6. A small rocket is launched from a height of 72 feet. The height of the rocket in feet, h, is represented by the equation 2( )166472h ttt , where t = time, inseconds. Find (a) how many seconds until the rocket reaches its maximum height, and (b) how many feet high it will be at that point.7. The height of a golf ball hit into the air is modeled by the equation 21696htt where h represents the height, in feet, and t represents the number of seconds that have passed since the ball was hit. (a) How many seconds until the ball reaches its maximum height? (b) What is its maximum height?