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At the beginning of an experiment, a scientist has 312 grams of radioactive goo. After 90 minutes, her sample has decayed to 19.5 grams.

At the beginning of an experiment, a scientist has 312 grams of radioactive goo. After 90 minutes, her sample has decayed to 19.5 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 59 minutes?

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