## Algebra 1: Common Core (15th Edition)

You have the sequence:5,10,15,20. Find the common ratio by using the formula: R=$\frac{a2}{a1}$,R=$\frac{a4}{a3}$.Plug in the values to get the ratios r=$\frac{10}{5}$=2 r=$\frac{20}{15}$=$\frac{4}{3}$ There is no common ratio, so the sequence is not geometric.