Math Help for Section 3.1, Page 105

Example
5: Check

$\eqalign{{\text{Perimeter}} &= 2 \bullet {\text{Length}} + 2
\bullet {\text{Width}}&{\small\color{red}\quad\quad
\text{Write verbal model.}}  \cr 96
&\overset{?}{=} 2
\bullet \color{red}36\color{black} + 2 \bullet \color{red}
12&{\small\color{red}\quad\quad \text{Substitute length and
width.}}  \cr 96 &\overset{?}{=} 72 +
24&{\small\color{red}\quad\quad \text{Multiply.}}  \cr
96 &= 96&{\small\color{red}\quad\quad \text{Solution
checks. }\checkmark} \cr} $

Note that each side of the equation represents a distance in feet.