## ashleighelizabeth 2 years ago A ball is thrown from the ground at a velocity of 64 feet per second. The formula h = –16t2 + 64t gives the ball’s height, in feet, after t seconds. How many seconds will it take the ball to reach its maximum height?

1. satellite73

max is at the vertex, first coordinate of the vertex of a parabola (which is what you are looking for) is always $$-\frac{b}{2a}$$ which in your case is $-\frac{64}{2\times (-16)}$

2. satellite73

better known as 2

3. ashleighelizabeth

Can you answer this one? : What is the y-intercept of the function that passes through the points (–3, 12) and (4, –2)?