Respuesta :
Answer:
The answer is C
Step-by-step explanation:
There are 3 y's and there are three z's
3(y+z) means that you are multiplying 3 and y, and 3 and z which gives you 3y+3y
Which also equals y+y+y+3z
D is the answer because if you combine it:
2y + y= 3y
3y= y+y+y
2z+z=3z
3z=3z