AlgebraEasyDepth function for a leaking pool
Algebra practice question
A pool is 150 centimetres deep and loses 2 centimetres of depth each day. Which function gives the depth d, in centimetres, after t days?
- A. d = 150 − 2tCorrect
- B. d = 150 + 2t
- C. d = 2t − 150
- D. d = 150t − 2
Answer: A. d = 150 − 2t
Start at 150 and subtract 2 for each day.
Why the other answers are wrong
- B. d = 150 + 2t
- This deepens the pool.
- C. d = 2t − 150
- This is negative for small t.
- D. d = 150t − 2
- This multiplies the depth by the days.
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