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 80 years.
Round your answers to the nearest gram as necessary.

Question

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 80 years. 
Round your answers to the nearest gram as necessary.

adamaero · Answer

Ignore the second part (for the beginning of setting it up)
What is half of cesium-137? 
137/2?

So...
A (30)=381 (1/2) ^(30)/30
A (30)=381 (1/2)
......