For credit click Add Work and show all your work to demonstrate your competence in using the quadratic formula a x h formula b C An object is thrown upward at a speed of 99 feet per second by a machine from a height of 4 feet off the ground The height h of the object after t seconds can be found using the equation 16t 99t 4 b b 4ac 2a When will the height be 48 feet Select an answer When will the object reach the ground Select an answer