Question 468545
If the width of a rectangle  is {{{5x-4}}}, then the length is {{{(5x-4)+8=5x+4}}}
The perimeter of a rectangle is {{{P=2(l+w)}}}, when l is length, w is width of a rectangle
{{{P=2(5x-4+5x+4)=20x}}}
Answer: 20x