Question

the sequence 1,-3,9,-27 is best described as
1. geometric
2.both arithmetic and geometric
3. arithmetic
4.neither

Answer 1

An arithmetic sequence is consistent so the difference between each number is the same lets see the difference between each number

Answer 2

Not the same number in between each number so now we know it is not arithmetic

Answer 3

ok

Answer 4

To see if it is a geometric progression see if it has a common ratio.
Divide second term by first term. Is it the same as when you divide the third term by the second term?

Answer 5

so it would be geometric