Chapter 4.6, Problem 18E

To determine

a) To find:

The function that models the mass remaining after t years.

To determine

b) To find:

The function that models the mass remaining after $t\text{ years}\text{.}$

To determine

c) To find:

The mass remaining sample after 80 years.

To determine

d) To find:

The number of years after sample remaining is 2g of cesium-137.