Solve the problem.Arches in the shapes of parabolas are often used in construction. Find the equation of a parabolic arc that is 20 feet high at its highest point and 22 feet wide at the base, as illustrated in the figure. Place the origin at the midpoint of the base.
A. y = - 
x2 + 20
B. y = -x2 + 22
C. y = -x2 + 20
D. y = 
x2 + 20
Answer: A
Mathematics
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A. d = -9 sin 
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A. 
B. 
C. 
D. 
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