Question

Someone mind checking my work?
The radioactive substance cesium-137 has a half-life of 30 years. The amount A(t) (in grams) of a sample of cesium-137 remaining after t years is given by the following exponential function.

A(t)=381(1/2)^t/30

Find the initial amount in the sample and the amount remaining after 50 years. Round your answers to the nearest gram as necessary.

initial amount = 381
after 50 years = 1270