Find the center, foci, and vertices of the ellipse.
+ 
= 1
A. center at (0, 0)
foci at (0, -4) and (0, 4)
vertices at (0, -16), (0, 16)
B. center at (0, 0)
foci at (- 
, 0) and (
, 0)
vertices at (-7, 0), (7, 0)
C. center at (0, 0)
foci at (0, - 
) and (0, 
)
vertices at (0, -7), (0, 7)
D. center at (0, 0)
foci at (-7, 0) and (7, 0)
vertices at (-49, 0), (49, 0)
Answer: B
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; 3?/2 < ? < 2?Find tan ?.
A. - 
B. - 
C. - 
D. - 
The population of the Earth is approximately 7 billion people and is growing at an annual rate of 2%. Assuming a Malthusian growth model, by what factor will the current population of the Earth increase in 50 years? Round to the nearest hundredths. ?
A. 19.03 B. 2.00 C. 7.00 D. 2.72 E. 7.72
Write the complex number in the form a + bi.3
A. 
+ 
i
B. 
+ 
i
C. 
+ 
i
D. 
+ 
i
Solve.x2 - 6x + 13 = 0
A. 3 ± 2i B. -3 ± 2i C. 6 ± 4i D. 5, 1