-x/2+3/2<5/2 I need help solving this can somebody explain how to do it

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 =

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16