Find the vertices and foci of the ellipse.
+ 
= 1
A. Vertices: (±20, 0); Foci: ( ±16, 0)
B. Vertices: (0, ±20); Foci: (0, ±16)
C. Vertices: (0, ±20); Foci: (0, ±12)
D. Vertices: (±16, 0); Foci: ( ±12, 0)
Answer: C
Mathematics
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Find the area of the region specified in polar coordinates.the region inside both 
and 
A. 
(? - 1)
B. 
(? - 2)
C. 
(? - 1)
D. 
(? - 2)
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Graph the inverse of the function plotted, on the same set of axes. Use a dashed curve for the inverse.
A. 
B. 
C. 
D. 
Function is its own inverse.
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Solve the system of equations by substitution. x + 2y = 23x - 7y = -7
A. (1, 1) B. (0, 0) C. (1, 0) D. (0, 1)
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Find the missing length(s) in the right triangle. Give an exact answer and, where appropriate, an approximation to three decimal places.
A. a = 4.500
B. a = 9
? 12.728
C. a = 1.732
D. a = 
? 6.364
Mathematics