A parabolic archway has the dimensions shown in Figure 15.42. If we draw coordinate axes as shown,
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A parabolic archway has the dimensions shown in Figure 15.42.
If we draw coordinate axes as shown, it can be shown that the equation of the archway portion is \[x^{2}=-4 c(y+3)\]
for some constant \(c\). Find the standard-form equation of the parabolic portion.
Figure 15.42
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3 ft y 12 ft 3 ft 13m oft 18 ft
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