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17 November, 17:18

For an arithmetic sequence where a 1

= 17 and the common difference is 5, find s 7

.

A. 219

B. 235

C. 229

D. 224

+1
Answers (2)
  1. 17 November, 17:23
    0
    The correct answer is C. 224
  2. 17 November, 17:38
    0
    S7 = (7/2) [2*17 + (7-1) * 5]

    = 3.5 * (34 + 30)

    = 3.5 * 68 = 224 answer

    D
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