Find the sum of the first 17 terms of the arithmetic sequence 10, 14, 18, 22, 26...
2 answers:
10, 14, 18 ....
notice, we get the next term by simply adding 4 to the current term, thus "4" is the "common difference, and we know that 10 is the first term.

The answer would be 714.
Common difference =4An=A1+(n-1)dA17=10+(17-1)(4)=10+(16)(4)=10+64=74
Sn=n(a1+an)/2S17=17(10+74)/2=714<span />
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