Algebra 1

The arch support of a bridge can be modeled by y=-0.0012x^2 where x and y are measured in feet. Find the height and width of the arch.

I don't know how to even attempt to solve this... If you know how, can you PLEASE help asap!!

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1. This cannot be right, as the vertex is at (0,0)
You need an equation of the form
y = a - bx^2
where the height of the arch is at a, and the width is 2√(a/b)

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oobleck

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