Question

Please, almost done with math tonight...if 6, 29/2, and 23 are the first three terms of an arithmetic sequence, what is the sum of the first 18 terms of the sequence?

Answer 1

you are all over the place with these

Answer 2

common different is \(\frac{29}{2}-6=\frac{17}{2}\)

Answer 3

i forget the formula for adding up the arithmetic sequence, but i bet we can find it

Answer 4

ah it is \(\frac{n}{2}(a_1+a_n)\) in one version

Answer 5

\[\frac{18}{2}(6+17(6+\frac{17}{2}))\]whatever that is

Answer 6

I should send you a gift basket for all the help you've given me.