AlgebraEasy–MediumEquation for a plant's height
Algebra practice question
A sunflower is 30 centimetres tall today and grows 4 centimetres each day. Which equation gives its height h, in centimetres, after d days?
- A. h = 30 + 4dCorrect
- B. h = 34d
- C. h = 4 + 30d
- D. h = 30 − 4d
Answer: A. h = 30 + 4d
Start at 30 and add 4 per day.
Why the other answers are wrong
- B. h = 34d
- This multiplies 34 by the days with no starting height.
- C. h = 4 + 30d
- This swaps the start and the rate.
- D. h = 30 − 4d
- This makes the plant shrink.
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