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

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Based on the side measures given, decide whether the triangle is equilateral, isosceles, or scalene. 

A. Equilateral B. Scalene C. Isosceles

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Write the solution set to the inequality in interval notation.x ? 3

A. (-?, 3] B. (3, ?) C. (-?, 3) D. [3, ?)

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