Question

Decide whether these sequences are arithmetic,
quadratic geometric or neither. Find the n-th term
a) 12, 15, 18, 21,...
b) 12,24, 48, 96, ...
c) 4,7, 12, 19, ...
d)12, 24, 36, 48
e) 12, 0, 12, 0,
f) 1, 7, 17, 31, ...
g) 12, 8, 4, 0, ...