anonymous
  • anonymous
find the sum of the arithmetic sequence having the data given. a1 = 5, an = 3, n = 20
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Do you know which formula to apply?
anonymous
  • anonymous
I have no idea, I missed a few days of class and I came back to a whole new lesson. Kinda just tryin to get caught up right now
anonymous
  • anonymous
S_n = n ( a_1 + a_n ) / 2

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anonymous
  • anonymous
chloro right
anonymous
  • anonymous
Do you know how to plug in?
anonymous
  • anonymous
nuh uh :/
anonymous
  • anonymous
Try a1 = ?
anonymous
  • anonymous
that easy
anonymous
  • anonymous
i can prove formula
anonymous
  • anonymous
Just go step by step!
anonymous
  • anonymous
no, sum sequense have formula, not step by step
anonymous
  • anonymous
@Adam1994 pls let me know a1?
anonymous
  • anonymous
a1=5
anonymous
  • anonymous
a_n?
anonymous
  • anonymous
ok, i know a litle english
anonymous
  • anonymous
a_n = 3
anonymous
  • anonymous
Would you double check this problem, I believe it's wrong!
anonymous
  • anonymous
Since n = 20 => we're looking for S_20
anonymous
  • anonymous
S_20 = 20 ( a_1 + a_20 ) / 2
anonymous
  • anonymous
Anyway, this is the formula for arithmetic Sum, just memorize it for your own benefit!

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