Find a2. ->
Find a1. -> 3.3
0, -10, 20, -30, 40, -50
if we start with n = 0. -> an = (-1)n10n
starting with n = 1. ->
1, 2, 3, 4,... ?
(I) an = n starting at n = 1 (II) an = n – 1 starting at n = 1 (III) an = n starting at n = 0 (IV) an = (n + 1) starting at n = 0 -> I and IV
0.5, 2, 4.5, 8, 12.5, ...
starting with n = 1. -> an = 1.5n – 1
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