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

Question 2 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 3 of 3

A radioactive sample has a half-life of 12 hours. If you start with 800 grams, how much remains after 36 hours?

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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