Ican't figure this question out. 50 points if you can answer this for me!

(a) gives the height at time , so the flare's starting height is given by :

(b) There are several ways to find the maximum height of the flare. One is to complete the square and write in vertex form:

That is, describes a parabola whose vertex is located at (9, 406); the coefficient of -5 tells us that the parabola is concave, which means the parabola "opens" downward, and the vertex is a maximum. So the maximum height is 406 m.

(C) The flare hits the ground when :

or at about and . We ignore the negative solution (negative time makes no physical sense).

the answer is 31.27mph