Enable text based alternatives for graph display and drawing entry

Try another version of this question

At the beginning of an experiment, a scientist has 164 grams of radioactive goo. After 270 minutes, her sample has decayed to 20.5 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 80 minutes?