Solve.The function A = A0e-0.01386x models the amount in pou…

Solve.The function A = A0e-0.01386x 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 initially put into the vault, how many pounds will be left after 60 years? Round your answer to the nearest whole number. 

Solve.The function A = A0e-0.01155x models the amount in pou…

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 500 pounds of the material are initially put into the vault, how many pounds will be left after 180 years? Round your answer to the nearest whole number.