Algebra practice question

Answer: 35

17 = 4a + 5 gives a = 3. Then f(10) = 30 + 5 = 35.

Common wrong answers

If you answered 3

3 is a, not f(10).

If you answered 30

30 is 3 × 10 without the +5.

If you answered 42.5

42.5 scales 17 by 10/4, treating f as proportional; the +5 makes it not proportional.

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