Question

find the snth term a(1) = 18, d = –10, n = 12

a.-552
b.-888
c.768
d.-444

Answer 1

Well, we have formulas for this sort of thing...
\[\Large a_n = a_1 + (n-1)d\]

Answer 2

Or, were you shooting for the sum...? In which case, after you get \(\large a_n\), use another formula...
\[\LARGE S_n = \frac{n(a_1+a_n)}{2}\]

Answer 3

whats the number changing by?

Answer 4

im trying to find the Sn for the arithmetic series

Answer 5

Gave you the formula... just plug in and go :)

Answer 6

alright

Answer 7

thx!