Algebra 1: Common Core (15th Edition)

Yes, the sequence is geometric.The common ratio is $\frac{3}{4}$
You have the sequence:256,192,144 and 108. Find the common ratio by using the formula: R=$\frac{a2}{a1}$=$\frac{a4}{a3}$.Plug in the values: r=$\frac{192}{256}$=$\frac{3}{4}$ r=$\frac{108}{144}$=$\frac{3}{4}$ There is a common ratio, r=$\frac{3}{4}$. So the sequence is geometric.