Question

Check my answers please
Identify each sequence below as geometric, arithmetic, or neither.
(a) 1, 3, 5, 7, 9, 11, 13, 15 AS
(b) 21, 16, 12, 9, 7, 6 N
(c) .3, .03. .003, .0003, .00003 GS
(d) -4, -12, -36, -108, -324 GS

Answer 1

Subtract successive pairs of terms. Do you get the same thing, every time? Arithmetic.
Divide successive pairs of terms. Do you get the same thing, every time? Geometic.

Answer 2

You are correct for all.