Question

12. (1 point) The height y (in feet) of a ball thrown by a child
is
y = −
1
16
x
2 +4x+5
where x is the horizontal distance in feet from the point at which
the ball is thrown.
(a) How high is the ball when it leaves the child’s hand?

(b) What is the maximum height of the ball?
(c) How far from the child does the ball strike the ground?

Answer 1

(a) y(0) = ?
(b)
this is just a parabola. You know the vertex is at x = -b/2a

(c) y=0 at x=?

c'mon - don't forget your Algebra I now that you're taking calculus...