Respuesta :

3catsawesome
x is 15
It is 15 because a rectangle has 2 sides same and another 2 sides the same so 1 set of sides is 25 and the other is 20. So you take the total (45) and put it into the equation 45=2x+15. So, 45-15= 30 then, 30/2 and you get 15.

Hope I Helped