Which expression has a value of 7? a.[(29-18)+(17+8)] divide by 6 b. [(29-18)+(17-8)] divided by 4 c. [(29++8)] divided by 2 d. [(29+18)+(17-8)] divided by 8

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 =