Exponential growth and decay

Model doubling, half-life, compound interest, and depreciation with y = a(b)^x.

Standards:F-LE.A.2F-IF.C.8.b

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

A radioactive isotope decays such that after each half-life of 12 years, the mass is multiplied by 1/2. If you start with 80 grams, how many grams remain after 36 years?

Question 2 of 3

A radioactive sample has a half-life of 8 days. If you start with 320 grams, how many grams remain after 24 days?

Question 3 of 3

A pharmaceutical company manufactures 504 doses of medicine. Quality control tests 5/9 of the doses. Of the tested doses, 3/7 pass inspection. How many doses pass inspection?

How this fits in

Exponential growth and decay is one skill in the Advanced Algebra unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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