Which expression represents the sum of (2x-5y and (x+y) ?

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

The perimeter of a rectangle is greater than or equal to 74 meters. if the length is 25 meters, the minimum width of the rectangle is meters.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.