A rectangle has side lengths (2x - 5) meters and (2x+6) meters. Write a linear expression in simplest form to represent the perimeter.
Find the perimeter if the value of x is 12 meters.

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?