At the beginning of an experiment a scientist has 300 grams of radioactive goo After 90 minutes her sample has decayed to 9 375 grams What is the half life of the goo in minutes Round to one decimal place The half life of the goo is 0 039 Find a formula for G t the amount of goo remaining at time t G t X How many grams of goo will remain after 80 minutes Round to one decimal places There will be 13 25 minutes X grams of goo after 80