A scientist models the number of grams of a radioactive substance with the expression 15.(1/2)^d/5, where d is the number of

Question

A scientist models the number of grams of a radioactive substance with the expression 15.(1/2)^d/5, where d is the number of days since the sample was measured.

1. After how many days has half of the substance disappeared through radioactive decay? Explain your reasoning.
2. After 20 days, will there be more or less than 1 gram of the substance left? Explain your reasoning.

Kunduz · Accepted Answer

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