Find the center, foci, and vertices of the ellipse.36x2 + 81y2 = 2,916
A. center at (0, 0)
foci at (-9, 0) and (9, 0)
vertices at (-81, 0), (81, 0)
B. center at (0, 0)
foci at (0, -6) and (0, 6)
vertices at (0, -36), (0, 36)
C. center at (0, 0)
foci at (- 3
, 0) and (3
, 0)
vertices at (-9, 0), (9, 0)
D. center at (0, 0)
foci at (0, - 3
) and (0, 3
)
vertices at (0, -9), (0, 9)
Answer: C
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What is the maximum value of 
? Restrict your attention to the horizontal span of 0 to 10. Round your answer to two decimal places, if necessary.
?
A. 8 B. 12.17 C. 0.83 D. 15.34
Find an equation of variation in which the following are true.x varies inversely as y2, and x = 18 when y = 7.
A. x = 882y2
B. x = 
C. x = 
D. x = 
Find the slope of the line containing the two points.(9, -5); (-7, 8)
A. 
B. 
C. - 
D. - 
Solve the right triangle for all missing sides and angles to the nearest tenth.
b = 20B = 17°37'
A. A = 72°23', c = 67, a = 21 B. A = 72°23', c = 21, a = 66.1 C. A = 72°23', c = 66.1, a = 21 D. A = 72°23', c = 66.1, a = 63