The answer C make more sense.
The first option is
![18(3x-1) = 18\cdot 3x - 18\cdot 1 = 54x-18](https://tex.z-dn.net/?f=%2018%283x-1%29%20%3D%2018%5Ccdot%203x%20-%2018%5Ccdot%201%20%3D%2054x-18%20)
The second option is
![6\cdot 9x + 6\cdot 1 = 54x + 6](https://tex.z-dn.net/?f=%206%5Ccdot%209x%20%2B%206%5Ccdot%201%20%3D%2054x%20%2B%206%20)
So, neither of them is equivalent to ![54x+18](https://tex.z-dn.net/?f=%2054x%2B18%20)
11 because -7 subtracted by 4 add kore to the 7 so think of it this way -7 is a bad guy and 4 is a bad guy to because its a subtraction so if both bad guys combine you get 11 because a negative with negative makes a positive so its 11
What do you mean, you need more information in your queston p,ease try to ask it again, it makes no Sence