Suppose that a certain radioactive substance has a half-life of 45 years. If there are presently 1,920 milligrams of the substance, how much, to the nearest milligram, will remain after 180 years?
A. Q = 130 milligram
B. Q = 120 milligram
C. Q = 135 milligram
D. Q = 95 milligram
E. Q = 125 milligram
Answer: B
Mathematics
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Express the integrand as a sum of partial fractions and evaluate the integral.
dx
A. ln 
- 
+ C
B. ln 
- 
+ 
+ C
C. ln 
+ 
+ C
D. ln 
- 
+ 
+ C
Mathematics
Determine whether the number is divisible by 2, 3, 4, 5, 6, 8, 9, and/or 10.40
A. 2, 4, 5 B. 2, 4, 5, 10 C. 2, 4, 5, 8 D. 2, 4, 5, 8, 10
Mathematics
Add or subtract as indicated.
+ 
A. x + 5 B. x - 6 C. x + 6 D. x - 5
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Find the probability.A bag contains 8 red marbles, 2 blue marbles, and 1 green marble. What is the probability of choosing a marble that is not blue when one marble is drawn from the bag?
A. 
B. 
C. 9
D. 
Mathematics