Answer:
[tex]P=20[/tex]
Step-by-step explanation:
The perimeter of a rectangle is represented by the following equation:
[tex]\begin{gathered} P=2l+2w \\ where, \\ l=\text{ length} \\ w=\text{ width} \end{gathered}[/tex]
Therefore, if each square represents one unit; l=7 and w=3
[tex]\begin{gathered} P=2(7)+2(3) \\ P=14+6 \\ P=20 \end{gathered}[/tex]
