Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 32 ft and the vertical clearance must be 28 ft at a point 15 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: D
Mathematics
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Solve the problem.Find the value of x so that the shaded region is a gnomon to the white rectangle.
A. 4 B. 7.2 C. 8 D. 5 E. none of these
Mathematics
Rationalize the denominator.
A. 
(
- 1)
B. 
(
+ 1)
C. 
(
+ 1)
D. 
(
+ 1)
Mathematics
Find the exact circumference of the circle.
A. 9? in. B. 81? in. C. 4.5? in. D. 18? in.
Mathematics
Solve the system of equations using the addition method. 5x - 7y = 2-10x + 14y = -6
A. (2, 3)
B. no solution
C. 
D. (5, 2)
Mathematics