At the beginning of an experiment, a scientist has 100 grams of radioactive goo. After 225 minutes, her sample has decayed to 12.5 grams.
1. What is the half-life of the goo in minutes?
2. Find a formula for G(t), the amount of goo remaining at time t. G(t) =
3. How many grams of goo will remain after 41 minutes?
I got 1. It is 75 minutes
how do you find a formula???