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At the beginning of an experiment, a scientist has 360 grams of radioactive goo. After 270 minutes, her sample has decayed to 5.625 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?