## College Algebra (10th Edition)

$E.$
Starting with the graph of figure 21, taking a=3, $f(x)=3^{x}$, and then shifting it down by 1 unit $\qquad$... $y=f(x)-1$ ... we obtain this graph. We look for $y=f(x)-1=3^{x}-1\qquad$... choice $E.$