Respuesta :

Answer:

4.  4x + 4

5. 7d + 28

6.   y^2 + 3y

7. x + 1

8. d + 4

9. y + 3

Step-by-step explanation:

4. 4*x + 4*1 = 4x + 4

5. 7*d + 7*4 = 7d + 28

6.  y*y + y*3 = y^2 + 3y

7. x + 1

8. d + 4

9. y + 3