I think its 10
Correct me if im wrong
But all u have to do is multiply 2.5 x 4=10
Check the picture below.
recall that in a square, all sides are equal, so if we make b = a, then we get that for one side, also recall that the area of a rectangle is length*width, so in this case,
If you are just simplifying it it would be 6x because it's 5x plus one more x but if you are trying to find x then I have no idea
Well, if every box is a unit, it would be 6 units in length.