# The half-life of P-32 is 14.30 days. How many milligrams of a 20.00 mg sample of P-32 will remain after 85.80 days?

##### 1 Answer

Aug 4, 2017

The amount remaining is

#### Explanation:

The half life is

This means that after

The time is

This is equal to

Therefore,

The amount remaining is

We can solve this problem with the equation

The radioactive constant is

Therefore,