HELP ME !!:( The suitcase shown has a height of x inches and a width of (x+2) inches. The volumen of the suitcase is (x^3 +6x^2 +8x) cubic inches . Find the length of the suitcase

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 =