1. The problem statement, all variables and given/known data Two children were bouncing a ball. During one particular bounce, the ball traveled a horizontal distance of 6 feet and its maximum height above the ground was 4 feet. The path was in the shape of a parabola. Find the standard equation of the parabola described by this information. Let x represent the horizontal distance in feet from the point the bounce started and y represent the height above the ground in feet. Here's the possible answers: http://img145.imageshack.us/img145/3118/possanswerszr3.jpg [Broken] 2. Relevant equations Standard form of a parabola: F(x)=a(x-h)^2 + k 3. The attempt at a solution Finding a is my problem, but ultimately you need to find the other variables before you can find a so essentially i am having problems with it all.