Write the decimal as an equivalent percent.0.021
A. 0.21%
B. 21%
C. 2.1%
D. 0.0021%
Answer: C
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The size N, in thousands, of a certain animal population after t years is given in the table below. Use exponential regression to model the population size as a function of time. Round your answer to two decimal places. t 0 1 2 3 4 N 6.68 8.57 10.77 13.94 18.08?
A. 
B. ?
C. ?
D. ?
Solve.A whispering gallery is a room in the shape of an elliptic reflector. If a source of sound is placed at one focal point of an elliptic reflector, the sound is reflected through the other focal point. If one person speaks at one focal point, then another person at the other can hear sounds as faint as a whisper. If the whispering gallery is based on the ellipse 
+ 
= 1, how many units from the center of the ellipse would the two people stand?
A. 15 units B. 9 units C. 12 units D. 144 units
Write a polar equation in r and ? of an ellipse with the focus at the origin, with the eccentricity 0.8 and vertex at  FIGURE 1.png)
 multiple choice.png)
Simplify. Assume that all variables represent positive real numbers.(5 - 5
)2
A. 75 - 50
B. 25 + 25
C. 25 - 25
D. 75 + 50