Solve the problem.The function A = A0e-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 300 pounds of the material are placed in the vault, how much time will need to pass for only 99 pounds to remain?
A. 170 yr
B. 160 yr
C. 165 yr
D. 320 yr
Answer: B
Mathematics
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Find the integral.
dx
A. 
ln (e6x + 1) + C
B. 13ln (e6x + 1) + C
C. 
(e6x + 1)-2 + C
D. 
ln (e6x + 1) + C
Mathematics
For the given probability density function, over the stated interval, find the requested value.f(x) = 
x over [0, 2
]; Find the median.
A. 
B. 
C. 2
D. 
Mathematics
Find the mean and median using the graph of the distribution. Round to the nearest tenth if necessary. 
A. mean = 10; median = 9 B. mean = 9.7; median = 10 C. mean = 10; median = 9.7 D. mean = 9; median = 10
Mathematics
Solve.
= 
A. 
B. 
C. 
D. 
Mathematics