Solve.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 16 ft and the vertical clearance must be 12 ft at a point 14 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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Find the distance between the two points.
A. 3
B. 45
C. 3
D. 45
Mathematics
Find the missing numbers.
A. (a) = 3, (b) = 1, (c) = 8, (d) = 5 B. (a) = 2, (b) = 2, (c) = 6, (d) = 5 C. (a) = 3, (b) = 1, (c) = 7, (d) = 4 D. (a) = 2, (b) = 1, (c) = 7, (d) = 5
Mathematics
Solve using the substitution method. Use a graphing calculator to check your answer. x + 9y = -41-7x + 9y = -73
A. (5, -6) B. (-4, -6) C. (4, -5) D. No solution
Mathematics
Simplify the expression.12(5z + 6) - 2
A. 50z + 60 B. 60z + 70 C. 60z + 4 D. 17z + 16
Mathematics