Solve the problem.The function A = A0e-0.00866x 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 193 pounds to remain?
A. 110 yr
B. 220 yr
C. 120 yr
D. 115 yr
Answer: A
Mathematics
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Plot the points given by the pairs.A(3, 1), B(-5, -6)
What will be an ideal response?
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Solve the equation.- 
a = -3
A. {1} B. {-6} C. {-7} D. {9}
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Plot the ordered pairs on the rectangular coordinate system provided.A(- 
, -4), B(-5, 2)
A. 
B. 
C. 
D. 
Mathematics
Find the center of mass of a thin plate covering the given region with the given density function.The region enclosed by the parabolas y = 18 - x2 and y = x2, with density ?(x) = x2
A. 
= 0, 
= 
B. 
= 0, 
= 9
C. 
= 9, 
= 0
D. 
= 0, 
= 18
Mathematics