Answer
$258$ miles
Work Step by Step
Formula: $19.95x + 0.12y$, where $x$ represents the number of days driven and $y$ represents every mile over $100$ miles driven per day.
Substitute numbers from the question into the formula and solve for $y$.
$19.95(2)+0.12y=46.86$
$39.90+0.12y=46.86$
$0.12y=6.96$
$y=58$
Since $y$ represents every mile over $100$ miles driven per day and Mr.Woo drove for $2$ days, Mr.Woo drove for $2(100) + 58$, or $258$ miles.