Question 252476
The half-life of a certain radioactive material is 85 days. This means whatever time we are given, divide it by 85, or t/85.
An initial amount of the material has a mass of 801 kg. This means that P = 801.
We can write the half life exponential formula:
{{{A = P (1/2)^(t/85)}}}
Next, t = 10 days. So,
{{{A = 801*(1/2)^(10/85)}}}
A ~ 738.273 Kg.