Total surface area??

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

Bring the fraction a/a-4 to a denominator of 16-a^2

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height