Answer
The length of the jewelry box is $13$ inches and the width is $5$ inches.
Work Step by Step
Let $x =$ the width of the jewelry box
$2(2x + 3) + 2(x) = 36$
$4x + 6 + 2x = 36$
$6x = 30$
$x = \frac{30}{6}$
$x = 5$ inches
Let $y = $ the length of the jewelry box
$y = 2x + 3$
$y = 2(5) + 3$
$y = 10 + 3$
$y = 13$ inches