AlgebraEasy–MediumFunction for cooling tea
Algebra practice question
A cup of tea at 90 degrees cools by 3 degrees every minute. Which function gives the temperature T, in degrees, after m minutes?
- A. T = 90 − 3mCorrect
- B. T = 90 + 3m
- C. T = 3m − 90
- D. T = 90m − 3
Answer: A. T = 90 − 3m
Start at 90 and subtract 3 for each minute.
Why the other answers are wrong
- B. T = 90 + 3m
- This makes the tea heat up.
- C. T = 3m − 90
- This starts at −90.
- D. T = 90m − 3
- This multiplies the starting temperature by the minutes.
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