Solve the problem.Conservationists tagged 130 black-nosed rabbits in a national forest in 1990. In 1,991, they tagged 260 black-nosed rabbits in the same range. If the rabbit population follows the exponential law, how many rabbits will be in the range 9 years from 1990?
A. 140
B. 133,120
C. 281
D. 66,560
Answer: D
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Round the whole number to the given place.A publishing company sold 47,268,591 books in 2000. Round the number of books sold to the nearest ten-million.
A. 47,000,000 B. 40,000,000 C. 47,270,000 D. 50,000,000
Solve the problem.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by 
What is the cost per ton for x = 300?
A. $101,351.35 B. $337.84 C. $416.67 D. $150,000.00
Suppose the concentration C(t), in mg/ml, of a drug in the bloodstream t minutes after an injection is given by 
Find the maximum concentration and when it occurs.
?
A. Maximum concentration of 14.72 mg/ml occurs after 2.00 minutes. B. Maximum concentration of 7.79 mg/ml occurs after 0.50 minutes. C. Maximum concentration of 1.35 mg/ml occurs after 10.00minutes. D. Maximum concentration of 14.46 mg/ml occurs after 2.40 minutes. E. Maximum concentration of 13.81 mg/ml occurs after 2.80 minutes.
Find the foci of the given hyperbola.6x2 - y2 - 72x + 4y + 116 = 0
A. (6 + 4
, 2), (6 - 4
, 2)
B. (2 + 4
, 6), (2 - 4
, 6)
C. (4
, 2), (- 4
, 2)
D. (4
, 0), (-4
, 0)