<PRE><B>Question 969187</B>
 h=-4.9t^2 + 180t + 2. 
Determine the following:

b)The time required for the rocket to reach its maximum height
max ht is the vertex, at t = -b/2a
t = -180/9.8 =~ 18.367 seconds
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a)The maximum height of the rocket
Sub 18.367 for t
Max ht = -4.9*18.367^2 + 180*18.367 + 2
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c)The time required for the rocket to reach the ground
-4.9t^2 + 180t + 2 = 0
Solve for t.
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