Answer
$627 \text{ cigarettes}$
Work Step by Step
Substituting $x=15$ in the given equation, $
y=-94.8x+2049
,$ then the value of $y$ is
\begin{array}{l}\require{cancel}
y=-94.8(15)+2049
\\\\
y=-1422+2049
\\\\
y=-1422+2049
\\\\
y=627
.\end{array}
Hence, the average annual number of cigarettes smoked by an American adult in 2015 is $
627 \text{ cigarettes}
.$
