At the beginning of an experiment, a scientist has 160 grams of radioactive goo. After 90 minutes, her sample has decayed to 5 grams.

What is the half-life of the goo in minutes?

Find a formula for $G(t)$, the amount of goo remaining at time $t$. $G(t) =$

How many grams of goo will remain after 65 minutes?