Michael J. answered • 11/14/17

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Effective High School STEM Tutor & CUNY Math Peer Leader

To find the height when it was first fired, evaluate h(0).

To find the maximum height, look at the k value in the vertex form. k=86

To find the time the flare reached its maximum height, look at the h value in the vertex form. h=4

To find out when the flare hit the water, set h(t) equal to zero and solve for t. You want to use the greater value of t.