Answer :

luana
[tex]unit\ rate=\frac{cost}{number\ of\ pencils}\\\\ cost=13\ dollars\\ number\ of\ pencils=5\\\\ unit \rate= \frac{13}{5}=2\frac{3}{5}\frac{dollars}{pensil}\\\\ Unit\ rate\ is\ 2\frac{3}{5}\ dollars\ per\ one\ pensil[/tex]