Advanced MathEasy–MediumRecognising exponential decay from a description
Advanced Math practice question
A pond loses 20% of its water volume each week through evaporation with no inflow. Which type of function best models the volume 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 week multiplies by 0.8 repeatedly — exponential decay.
Why the other answers are wrong
- B. A decreasing linear function
- Linear would lose a fixed AMOUNT each week.
- C. An increasing exponential function
- The volume is falling.
- D. A quadratic function
- No squared relationship is involved.
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