anonymous
  • anonymous
Find the sum of the summation of 3 i plus2, from i equals 5 to 13.
Mathematics
chestercat
  • chestercat
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tkhunny
  • tkhunny
Have you considered substituting the values given for 'i' and adding them up? Are you supposed to use the Arithmetic Series sum formula? Show your work!
anonymous
  • anonymous
Sn=n/2(a1+an)?
tkhunny
  • tkhunny
I'll take that as a 'yes' to the second question. Okay, how do you interpret the formula, in light of the problem statement? What is a1? What is n? What is an?

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anonymous
  • anonymous
a1=17
anonymous
  • anonymous
n=13
anonymous
  • anonymous
an is the number youre looking for
tkhunny
  • tkhunny
a1 = 3*5 + 2 = 15 + 2 = 17 -- Good. n = count(5, 6, 7, 8, 9, 10, 11, 12, 13) = 9 -- Whoops!
anonymous
  • anonymous
okay! so thats where i was going wrong
tkhunny
  • tkhunny
n is the number of terms. Never underestimate the power of simply counting.
anonymous
  • anonymous
is the answer 261?
tkhunny
  • tkhunny
You tell me.
anonymous
  • anonymous
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tkhunny
  • tkhunny
Done. You are now an expert. Move on to the next one.

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