Exponential Decay

Model depreciation and radioactive decay.

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Watch the video

Start here (or skip if you already know it)

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Visualize it

Explore it, then spot the correct graph

3️⃣

Practice problems

Answer 3 problems (80%+ correct)

Step 1: Watch

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Exponential Growth and Decay

The Organic Chemistry Tutor · 12:49

Play with the interactive model to see how the math works, then test yourself by spotting the correct graph.

Move the controls and watch the math change — build a picture in your head before you solve.

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Decay: y = a(1 − r)ᵗ where r is the decay rate.

Try the Quiz tab to test your visual intuition for this skill.

Answer 3 problems with at least 80% correct to complete this skill.

Problem 1

A car worth $20,000 depreciates 15% per year. Value after 1 year?

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