Answer:
I am not sure what model you are talking about, no options to choose from
Step-by-step explanation:
You can divide both by 10, making the problem 16 / 4, which would look like 4 piles of four.
This means that the model that looks like 4 groups of 40
9x^2-9x-3
3x*3x=9x^2
3x*-4=-12x
1*3x=3x
1*-4=-3
9x^2-12x+3x-3
I think john is 10 years old hope that helps.