What is the area of triangle HGF? Round your answer to the nearest tenth of a square centimeter. Recall that you need to round up if the value of the hundredth is 5 or greater?

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?

What is the slope of the line that contains the points (-2,1) and (0,-3)

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?