Vanessa throws a tennis ball in the air. The function h(t) = -15t^2 + 45t + 10 represents the distance in feet, that the ball is from the ground at any time in seconds, t. What is the maximum height of the ball?
+47 Since the leading coefficient is negative, the quadratic opens downward.
The maximum height of the ball is the vertex of the parabola. Formula for the vertex is -b/2a with quadratic equation ax^2+bx+c
So the answer is -45/-30=1.5 feet.
Hope that helps
+36916 CLOSE HW...but not quite
- b/2a = -45/-30 = 1.5 seconds the TIME the ball is at a maximum
you must sub t = 1.5 into the equation to get the maximum HEIGHT ....
