Answer:
1.410
Step-by-step explanation:
31, 40, 49, 58 ...
a1 = 31
d = 40 - 31 = 9
Sn = n/2 (2a1 + d (n - 1))
S15 = 15/2 (2 (31) + 9 (15 - 1))
S15 = 15/2 (62 + 126)
S15 = 15/2 (188)
S15 = 1.410
I hope this helps
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Answers & Comments
Answer:
1.410
Step-by-step explanation:
31, 40, 49, 58 ...
a1 = 31
d = 40 - 31 = 9
Sn = n/2 (2a1 + d (n - 1))
S15 = 15/2 (2 (31) + 9 (15 - 1))
S15 = 15/2 (62 + 126)
S15 = 15/2 (188)
S15 = 1.410
I hope this helps