Advanced MathEasy–MediumRecognising exponential decay from a description
Advanced Math practice question
A cup of tea's temperature above room temperature falls by 10% every minute. Which type of function best models the temperature difference over time?
- A. A decreasing exponential functionCorrect
- B. A decreasing linear function
- C. An increasing exponential function
- D. A quadratic function
Answer: A. A decreasing exponential function
Losing a fixed percentage each minute multiplies by 0.9 repeatedly: exponential decay.
Why the other answers are wrong
- B. A decreasing linear function
- Linear decay would lose a fixed number of degrees each minute.
- C. An increasing exponential function
- The difference is falling.
- D. A quadratic function
- No squared relationship.
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