9
algebra

Solve for aa: S=n2(a+l)S = \frac{n}{2}(a + l)

A

a = (2S / n) - l

B

a = (S / 2n) - l

C

a = 2S - n - l

D

a = (2S - l) / n

Correct Answer: A

Choice Choice B is the correct answer.

  1. Start: S=n2(a+l)S = \frac{n}{2}(a + l)
  2. Multiply by 2: 2S=n(a+l)2S = n(a + l)
  3. Divide by n: 2Sn=a+l\frac{2S}{n} = a + l
  4. Subtract l: a=2Sn−la = \frac{2S}{n} - l

Choice Choice D is incorrect because algebra error.

Choice Choice B is incorrect because fraction error.

Choice Choice C is incorrect because algebra error.

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Linear Functions Set 37