Respuesta :

1. = 12a
2. = -6b
3. = 20c
4. = 6d
1. 3(a+3) > 3*a + 3*3 = 3a + 9 same with number 2
3. 5(6c - 2) > 5*6c - 5*2 = 30c - 10 same with number 4