Use models to prove that 3(a+b) is equivalent to 3a + 3b

Method One: "Plug-in Method"
To do this, you could plug in two numbers for a and b to check that they get the same value:

Therefore:
3(a+b)=3a+3b

Method Two: "Setting Equal Method"
By setting the two statements equal to each other, you can see they are the same because everything cancels out


*Keep in mind these aren't theoretical names, simply what I'm calling my two methods!

I hope this helps!!

The answer should be c.

Wait what the question