The radioactive substance cesium-137 has a half-life of 30 years. The amount A(t) (in grams) of a sample of a sample of cesium-137 remaining after t years is given by the following exponential function. A(t) = 458(1/2) 1/30 Find the amount of the sample remaining after 40 years and after 100 years. Amount after 40 years:  Amount after 100 years:

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