Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 45 ft and the vertical clearance must be 18 ft at a point 21 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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Multiply and simplify.
? 
A. 
B. x - 3
C. 
D. 
Mathematics
Use the quadratic formula or graphing methods to solve the inequality.6x2 - 27x + 6 ? 0
A. 
? 0.234 ? x ? 
? 4.266
B. x ? 
? 0.234 or x ? 
? 4.266
C. x ? 
? 0.234
D. x ? 
? 4.266
Mathematics
Write the fraction as an equivalent fraction with the given denominator.
= 
A. 
B. 
C. 
D. 
Mathematics
Find the product. Assume all variables have non-negative values.(
+ 4)(
- 4)
A. 9
B. 13 - 2
C. 29
D. -3
Mathematics