Question

What is the common ratio of the following geometric sequence? 5, 15, 45,...
any help please? math is hard for me .

Answer 1

The common ratio is determined by dividing and term by the term immediately preceding it. In general,\[r=\frac{ a_n }{ a_{n-1} }\]In your question you could use\[r=\frac{ 15 }{ 5 }\]or\[r=\frac{ 45 }{ 15 }\]

Answer 2

i got r=3 for both, so that would be the ratio?

Answer 3

That's right. In a geometric sequence, the common ratio is the same no matter which two terms you use. That's why it's called a "common" ratio.

Answer 4

ohh okay! idk why online school makes this so hard to understand

Answer 5

There's lots of folks here that can help you understand anything you're not sure about.

Answer 6

i know, thank you again, is it okay if i tag u in other questions i may have? or just to have someone else check my anwser?