SOLUTION: Q4. The function A = Aoe-0.0099x 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

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Question 1007139: Q4. The function A = Aoe-0.0099x 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 400 pounds of the material are initially put into the vault, how many pounds will be left after 40 years?
a. 350 pounds
b. 269 pounds
c. 114 pounds
d. 119 pounds
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
For the function
A%28x%29+=+Ao%2Ae%5E%28-0.0099x%29
just plug 400 in for Ao and 40 in for x...you'll need a calculator...you get
A(40) = 269.2 pounds or
Choice B