Me with my math pls need to graduate

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 =

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax