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Exponential models: growth and decay — Homework

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Exponential models: growth and decay — Homework

Build each model, then evaluate it at the requested time. Keep r as a decimal throughout.

  1. 1.A $1500 investment grows 6% per year. Write the model.
  2. 2.Using that model, find the value after 4 years (round to the nearest cent).
  3. 3.A machine worth $9000 depreciates 10% per year. Write the model and find its value after 3 years.
  4. 4.A bacteria colony of 200 triples every hour. Write the model and find the count after 3 hours.
  5. 5.Which loses value faster long-term: something decaying at 8% per year or 15% per year? Why?
  6. 6.A friend says "the model lost 20%, so multiply by 0.20." Explain the mistake.
🌲 Homeschool for the FutureNinth Grade · Math · week 18 homework