a frog is sitting on a stump 24 ft above the ground. it hops off the stump and lands on the ground 8 ft away. during its leap, its height h is given by the equation h=-0.5x^2+x+24 where x is the distance from the base to the stump, and h is height in ft. how far was the frog from the base of the stump when it was 21.12 ft above the ground?

Simplify the answer. type an integer or a decimal. round to nearest tenth if needed.