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29 September, 10:57

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

+2
Answers (2)
  1. 29 September, 12:33
    0
    S7 = (7/2) [2*17 + (7-1) * 5]

    = 3.5 * (34 + 30)

    = 3.5 * 68 = 224 answer

    D
  2. 29 September, 13:18
    0
    The correct answer is C. 224
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