Versatile Distributive Property

Geometry formulas
Situation: Find the perimeter of a rectangular area with a length of 13 inches and a width of 7 inches.

I do not know really know what calculation with distribution really means so I would like some advice on how to solve this problem.

Thank you!

Since there are two pairs of congruent sides,

2*13 + 2*7 = 2(13+7) = ___