Question

Determine whether each sequence is arithmetic or geometric. Sequence 1: –10, 20, –40, 80, ... Sequence 2: 15, –5, –25, –45, ...

A. Sequence 1 is arithmetic and Sequence 2 is geometric.

B. Both sequences are geometric.

C. Sequence 2 is arithmetic and Sequence 1 is geometric.

D. Both sequences are arithmetic.

sequence 2 may be arithmetic because -20 but I can't find out what sequence 1 is

Answer 1

C. Sequence 2 is arithmetic and Sequence 1 is geometric.

Explanation:

Answer 2

Hello,

Answer C

-10,20,-40,80,...
`u_(n+1)=(-2)*u_(n)`. is geometric

15,-5,-25,-45...
`u_(n+1)=u_(n)-20`. is arithmetic