Hi

h= -0.00635x^2+4.0005x-0.07875

Note: the vertex form of a parabola,  where(h,k) is the vertex

h= -0.00635x^2+4.0005x-0.07875  |Completing the square

h = -.00635[[(x-315)^2 - 99225] -.07875

h = -.00635[(x-315)^2 + 630.07875 -.07875

h = -.00635[(x-315)^2 + 630  Vertex(315,630) a = -.00635 < 0 parabola opens downward

 Maximum height is 630

 

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