Find the center, foci, and vertices of the ellipse.81x2 + 49y2 = 3969
A. center at (0, 0)
foci at (- 4
, 0) and (4
, 0)
vertices at (-9, 0), (9, 0)
B. center at (0, 0)
foci at (0, -9) and (0, 9)
vertices at (0, -81), (0, 81)
C. center at (0, 0)
foci at (0, 9) and (7, 0)
vertices at (0, 81) and (49, 0)
D. center at (0, 0)
foci at (0, - 4
) and (0, 4
)
vertices at (0, -9), (0, 9)
Answer: D
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Solve the problem.Median family income in Country X between 1990 and 1999 can be modeled by 
where x is the year. Determine symbolically when the median income was $42,216.
A. x ? 1998 B. x ? 2000 C. x ? 1994 D. x ? 1996
Write a numerical expression for the phrase and simplify it.Twelve minus four plus negative twenty one
A. 12 + 4 + (-21); -5 B. 12 - 4 + (-21); 29 C. -12 - 4 + (-21); 5 D. 12 - 4 + (-21); -13
Provide an appropriate response.For the pair of similar triangles, name the congruent angles and proportional sides.?ABC ~ ?MNO
A. ?A ? ?M, ?B ? ?N, ?C ? ?O; 
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= 
B. ?A ? ?O, ?B ? ?N, ?C ? ?M; 
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C. ?A ? ?N, ?B ? ?M, ?C ? ?O; 
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D. ?A ? ?M, ?B ? ?O, ?C ? ?N; 
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