Someone answer these

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

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 =

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5