## Algebra and Trigonometry 10th Edition

The graph labeled as (b) matches with $a_n=18(\frac{3}{2})^{n-1}$
$a_n=a_1r^{n-1}$ $a_n=18(\frac{3}{2})^{n-1}$ $a_1=18$ $r=\frac{3}{2}$ Since $a_1\gt0$ and $r\gt1$, the terms of the sequence are positive with their absolute values increasing.