The answer is 6. I know that because I solved the question and I got 6 I'm positive its 6. Hope this helps.
C is your correct answer on this one
The brackets are first, then the multiplication
The problem ask on which if the following is the value of M5 and M7 if transversal EF cuts parallel lines AB and CD as show in your diagram and the best answer would be letter D. m5 = 55.1 adn m7 =124.9. I hope you are satisfied with my answer and feel free to ask for more