Question

If a rectangle has a width of 5 and a perimeter of 26 what is the length of the rectangle

Answer 1

$\bf \textit{perimeter of a rectangle}\\\\ P=2(L+w)~~ \begin{cases} L=length\\ w=width\\[-0.5em] \hrulefill\\ w=5\\ P=26 \end{cases}\implies 26=2(L+5)\implies \cfrac{26}{2}=L+5 \\\\\\ 13=L+5\implies 8=L$