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February 1, 2015

February 1, 2015

Posted by **dan** on Wednesday, June 13, 2012 at 1:44pm.

4 + 9 + 14 + 19 + …….94 + 99 + 104

- math -
**Reiny**, Wednesday, June 13, 2012 at 2:25pmfirst you have to know how many terms you have

what term is 104

a + (n-1)d = term(n)

4 + (n-1)(5) = 104

5n - 5 = 100

5n = 105

n = 21

now sum(21) = (first + last)(21/2)

=(4+104)(21/2) = 1134

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