SOLUTION: Evaluate the arithmetic series 8+17+26+35...,n=13

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Question 709818: Evaluate the arithmetic series 8+17+26+35...,n=13
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

general formula is %28-1+%2B+9n%29
for n=1...=>...%28-1+%2B+9%2A1%29=8
for n=2...=>...%28-1+%2B+9%2A2%29=-1%2B18=17
for n=3...=>...%28-1+%2B+9%2A3%29=-1%2B27=26
for n=4...=>...%28-1+%2B+9%2A4%29=-1%2B36=35
for n=5...=>...%28-1+%2B+9%2A5%29=-1%2B45=44
for n=6...=>...%28-1+%2B+9%2A6%29=-1%2B54=53
for n=7...=>...%28-1+%2B+9%2A7%29=-1%2B63=62
for n=8...=>...%28-1+%2B+9%2A8%29=-1%2B72=71
for n=9...=>...%28-1+%2B+9%2A9%29=-1%2B81=80
for n=10...=>...%28-1+%2B+9%2A10%29=-1%2B90=89
for n=11...=>...%28-1+%2B+9%2A11%29=-1%2B99=98
for n=12...=>...%28-1+%2B+9%2A12%29=-1%2B108=107
for n=13...=>...%28-1+%2B+9%2A13%29=-1%2B117=116