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

You are given the sequence -3,-1,3,1.The starting value $a_{1}$=-3.Find the common ratio by using the formula: R=$\frac{a2}{a1}$,R=$\frac{a4}{a3}$.Plug in the values to get the ratio: r=$\frac{-1}{-3}$=$\frac{1}{3}$ r=$\frac{3}{1}$=3 There is no common ratio. So the sequence is not geometric.