When a lemur leaps across the ground, it travels forward 30 feet and reaches a height of 10 feet in the air. Each leap takes 2 seconds from take-off to landing. Model the lemur’s leap with the equation of a parabola in which x = the elapsed time in seconds and y = the height off the ground in feet. [Hint: A parabola in vertex form is written y = a(x – h)² + k when (h, k) is the vertex.]