Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 25 ft and the vertical clearance must be 20 ft at a point 18 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
Mathematics
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Divide and reduce to lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Provide an appropriate response.The graph of a function of two variables, f(x, y), is a surface. In general, what geometrical description can be given to the intersection of two surfaces?
A. Curve B. There is no general description. C. Plane D. Surface
Mathematics
Estimate the answer by rounding as indicated.Estimate by first rounding to the nearest hundred.
A. 1700 B. 717,800 C. 717,840 D. 700,000
Mathematics
Graph.2 ? f(x) + 4x = 6 + 4x
A. 
B. 
C. 
D. 
Mathematics