Question 73643
The formula to find the length is {{{P=2w+2l}}}
So, plug in the value of W to get {{{l=18.1cm}}}

The equation for the second one is simply the length multiplied by the width.
So {{{LW=A}}} or {{{7.2(w)=96}}}
So, {{{w=13.333333...}}} or {{{40/3}}}