Solve.The function A = A0e-0.01155x 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 53 pounds to remain?
A. 300 yr
B. 155 yr
C. 150 yr
D. 160 yr
Answer: C
Mathematics
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A. d = 
, 0
B. d = - 
, 0
C. d = 
, 0
D. d = - 
, 0
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Solve the problem.If ? is the mean and ? is the standard deviation of a normal distribution, then which of the following statements is true?
A. ? must always be positive, ? can be positive or negative. B. ? and ? must always be positive numbers. C. ? must always be bigger than ?. D. ? must always be positive, ? can be positive or negative. E. none of these
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Add or subtract as indicated.12
+ 2
+ 6
+ 20
A. 20
B. 20
+ 20
C. 51
D. 40
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Change the following binary number to decimal form.
A. 
B. 
C. 
D. 
E. 
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