Solve.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 26 ft and the vertical clearance must be 13 ft at a point 21 ft from the center. Find an equation for the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: B
Mathematics
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Solve the problem.Find the moment of inertia about the y-axis of the thin semicircular region of constant density 
bounded by the x-axis and the curve 
.
A. 
?
B. 320?
C. 160?
D. 
?
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For what values of x does the series converge conditionally?
A. x = 3 B. x = 3, x = 5 C. x = 5 D. None
Mathematics
Based on the side measures given, decide whether the triangle is equilateral, isosceles, or scalene. 
A. Equilateral B. Scalene C. Isosceles
Mathematics
Write the solution set to the inequality in interval notation.x ? 3
A. (-?, 3] B. (3, ?) C. (-?, 3) D. [3, ?)
Mathematics