Perform the indicated operations. Simplify when necessary.
A. - 
B. - 
C. 
D. 0
Answer: B
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Determine the center, foci, and vertices of the ellipse.
+ 
= 1
A. center at (0, 0)
foci at (0, 9) and (2, 0)
vertices at (0, 81), (4, 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) and (
, 0)
vertices at (-9, 0), (9, 0)
D. center at (0, 0)
foci at (0, - 
) and (0, 
)
vertices at (0, -9), (0, 9)
Evaluate the indicated trigonometric function of the acute angle ?.If ? is an acute angle of a right triangle and if cos ? = 
, then find the value of sec ?.
A. 
B. 3
C. 
D. 
Using the appropriate right triangle, find the exact value of the trigonometric expression.cos 30°
A. 
B. 
C. 
D. 
Write the first five terms of the geometric sequence.a1 = -7; r = -3
A. -3, 21, -63, 189, -567 B. -7, -10, -13, -16, -19 C. -7, -21, -63, 189, -567 D. -7, 21, -63, 189, -567