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

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1. anonymous

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$r=\frac{ 45 }{ 15 }$

2. anonymous

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

3. anonymous

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.

4. anonymous

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

5. anonymous

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

6. anonymous

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?

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