AlgebraEasyHeight of a growing plant
Algebra practice question
A seedling is 4 centimetres tall and grows 1.5 centimetres each week. How tall, in centimetres, will it be after 6 weeks?
Answer: 13
Height = 4 + 1.5 × 6 = 4 + 9 = 13.
Common wrong answers
- If you answered 9
- 9 is the growth alone (1.5 × 6), without the starting 4 centimetres.
- If you answered 33
- 33 is (4 + 1.5) × 6, adding the start to the rate before multiplying.
- If you answered 11.5
- 11.5 is 4 + 1.5 × 5, one week short.
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