Which expression can represent the difference of a number from four times three?

First, let's find a way to represent the difference of a number from 4. If we say the number is x, then this would be represented by 4-x. The x is being subtracted because the question asked for the difference of a number FROM four. Then we need to multiple the whole thing by three to get (4-x)*3 or 3(4-x).

I hope this helps.