AlgebraEasy–MediumInequality for fencing still needed
Algebra practice question
A gardener needs at least 40 metres of fencing and already has 15 metres. Which inequality describes the length f, in metres, of fencing she must still buy?
- A. 15 + f ≥ 40Correct
- B. 15 + f ≤ 40
- C. f ≥ 40
- D. 15f ≥ 40
Answer: A. 15 + f ≥ 40
What she has plus what she buys must reach at least 40.
Why the other answers are wrong
- B. 15 + f ≤ 40
- At least means greater than or equal.
- C. f ≥ 40
- This ignores the 15 metres she has.
- D. 15f ≥ 40
- The lengths add; they are not multiplied.
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