A., B., C., D., are NOT true. I think this is a trick question. Lol
Answer: B) -5
Step-by-step explanation: all you do is subtract 12 from each side and you will get -5
M = (1,4)
N = (5,2)
For M, you simply move to 1 on the x axis abs for 4 you move on the y axis. Same does for N, for 5 you move on the x axis and for 2 you move on the y axis.
I'm pretty sure that the answer would be 11.
A weight lifter can bench press 189 kg. How many milligrams (mg) is this?
Answer: We know that:

We are given, that a weight lifter can bench press 189 kg
Therefore, a weight lifter can bench press:



Therefore,
is equal to the 