mwood8770
mwood8770 mwood8770
  • 24-01-2018
  • Mathematics
contestada

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

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jackiearjona
jackiearjona jackiearjona
  • 24-01-2018
The correct answer is C. 224
Answer Link
Аноним Аноним
  • 24-01-2018
s7  = (7/2)[2*17 + (7-1)*5]

  = 3.5 *  (34 + 30)

= 3.5 *  68  =  224 answer

D
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