AlgebraEasy–MediumOutput of a linear model
Algebra practice question
A plant is 2 centimetres tall when bought and grows 0.5 centimetres per day. How tall, in centimetres, will it be after 20 days?
Answer: 12
2 + 0.5 × 20 = 12.
Common wrong answers
- If you answered 10
- 10 is the growth alone, without the starting height.
- If you answered 22
- 22 adds 20 to 2, treating the rate as 1 per day.
- If you answered 50
- 50 is (2 + 0.5) × 20, adding the starting height into the daily rate.
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