Height of the arch 5 inches from the center = 15 inches.
Arch has a height = 16 inches
An equation that models the arch is y = [tex]x^{2}[/tex] + 16
x is the horizontal distance from the center and y is the height.
The arch has a span of 40 inches, so the arch meets the ground 20 inches from the center. That means
0 = 400a + 16
a = - 1/25
Thus, the equation for height that is based on distance from the center is:
y = - 1/25[tex]x^{2}[/tex] + 16
= - 1/25 x [tex]5^{2}[/tex] = 16
= 15 inches
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