Mark M. answered • 03/11/19

Mathematics Teacher - NCLB Highly Qualified

Half has decayed when d/5 = 1, or 5 days.

Juan R.

asked • 03/11/19A 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. After how many days has half of the substance disappeared through radioactive decay?

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Mark M. answered • 03/11/19

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Mathematics Teacher - NCLB Highly Qualified

Half has decayed when d/5 = 1, or 5 days.

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