Question

Is the sequence 5, 9, 15, ... an arithmetic sequence? Explain.

Answer 1

if the difference of any two consecutive terms (\(d=a_n-a_{n-1}\)) is constant, then it is a arithmetic sequence.

Answer 2

Compare 9-5 with 15-9.

Answer 3

so it is an arithmetic sequence?

Answer 4

use your brain...

Answer 5

shut up i'm not good at maths

Answer 6

are 9-5 and 15-9 equal?

Answer 7

no they are not equal. So i guess that means it isn't an arithmetic sequence. Can u explain why?

Answer 8

good.
that's why.
if the sequence were an arithmetic one, both differences are supposed to be equal.

Answer 9

ok thank you