The perimeter of quadrilateral jklm is 90 centimeters. which is the length of side kl?

The perimeter of an object is given by the sum of all the sides of the object. Thus the perimeter of a quadrilateral is the sum of the four sides of the quadrilateral.

Given a quadrilateral with sides: n, 2n - 12, 3n + 4, n + 7

The sum is n + 2n - 12 + 3n + 4 + n + 7 = 7n - 1 = 90

Thus, 7n = 90 + 1 = 91 and n = 91 / 7 = 13.

Therefore, the length of the side KL is n = 13 centimeters.