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Math

Answered

8. Find the sum of the first 15th terms of the arithmetic sequence whose nth term is = 5 + 2n.
A) 310
B) 315
C) 410
D) 415

Sagot :

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Answer:

Step-by-step explanation:

Tn=5+2n

T1=7

T2=9

d=9-7=2

Sn=n/2(T1+Tn)

T15=5+30=35

S15=15/2(7+35)=15(21)=315

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