We know that the shorter side measures 10 inches, and the perimeter is 52 inches.
We have to use the perimeter formula
[tex]P=2(w+l)[/tex]Where l = 10 inches, and P = 52 inches. Let's replace these values
[tex]52=2(w+10)[/tex]Now, we solve for w
[tex]\begin{gathered} \frac{52}{2}=w+10 \\ 26=w+10 \\ w=26-10 \\ w=16 \end{gathered}[/tex]