Respuesta :

10: ac+bc = (a+b)c
7: the sum of the large rectangle is equine to the some of the two smaller rectangles
8: to make sorter and simpler by combining like turns
6: 10x, 5x +5x, 2(x + 5)
9: 2a +3 + a+4, 5x, 6+ 2x+x2+1+x