Question: Please help me solve these showing all work !! Page 5 9 . The decay of a 150 gram sample of a particular radioactive substance

Please help me solve these showing all work !!

Page 5 9 . The decay of a 150 gram sample of a particular radioactive substance can be modeled by the exponential function: A(t) = 150e-0.057t ',where t is in months and A(t) is the amount of radioactive substance in grams that remains after t months. Find the following algebraically. a. How many grams of the radioactive substance remains after 21 months? Round to the nearest tenth of a gram. ( 5 pts.) b. After how many months will there remain 25 grams of the substance? Round to the nearest tenth of a month. ( 10 pts. )

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