Solve the problem.The half-life of a certain radioactive substance is 20 years. Suppose that at time 
there are 30 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 30(1/2)t/20. How many grams of the substance will remain after 80 years?
A. 0.47 g
B. 0.23 g
C. 1.88 g
D. 0.94 g
Answer: C
Mathematics
You might also like to view...
Solve. Remember to insert units when writing your answer.An oil drum holds 31 gal of oil. If 7 gal and 3 qt have been removed, how much oil remains?
A. 24 gal 1 qt B. 23 gal 1 qt C. 23 gal 5 qt D. 24 gal 3 qt
Mathematics
Solve the linear equation.-5x + 1 + 2x + 3 = 10
A. 
B. 
C. 
D. 
Mathematics
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
- 4
+ 6
A. 2
B. 21
C. 2
D. 21
Mathematics
Evaluate the logarithm without the use of a calculator.log9 
A. -81 B. -3 C. 81 D. 3
Mathematics