Solve.An arch in the shape of the upper half of an ellipse is used to support a bridge spanning a creek 30 feet wide. The center of the arch is 9 feet above the center of the creek. Write the equation for the ellipse in which the x-axis coincides with the road and the y-axis passes through the center of the arch.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: D
Mathematics
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