Question

A sample of radioactive material weighing 45 grams has a decay rate of 4.25% each day. The equation y = 45(2.7)–0.0425t can be used to find the amount of material that still remains, where t is the number of days that have passed. Approximately what is the amount of material that still remains after 32 days?

Y = 45*2.7 - 0.0425*32,
Y = 121.5 - 1.36 = 120.14

Make sure the given Eq is correct.

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