Solve the problem.The function A = Aoe-0.00693x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 500 pounds of the material are placed in the vault, how much time will need to pass for only 379 pounds to remain?
A. 80 years
B. 45 years
C. 50 years
D. 40 years
Answer: D
Mathematics
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Use a CAS to perform the integration.
A. 
ln x - 
+ C
B. 
ln x - 
+ C
C. 
ln x + 
+ C
D. 
ln x - 
+ C
Mathematics
Express the sum using summation notation. Use a lower limit of summation, not necessarily 1, and k for the index of summation.33 + 43 + 53 + . . . + 93
A. 
B. 
C. 
D. 
Mathematics
Convert the improper fraction to a mixed number.
A. 6
B. 7
C. 5
D. 6
Mathematics
Perform the operation. Write the answer as a fraction in lowest terms.31
- 12
A. 
B. 19
C. 
D. 172
Mathematics