## 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 .

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