Question

A projectile is fired from a cliff 500 feet above the water at an inclination of 45 degrees to the horizontal, with a muzzle velocity of 300ft per second. The height of the projectile aboce the water is given by h(x)=-32x^2/(300)^2+x+500, where x is the horizontal distance of the projectile from the base of the cliff. Find: The maximum height and find when the projectile hits the water .. thank youu