exam Maths Puzzle Numerical Ability

Manufacturing: What is the total length of belting needed for the pulley? A=4ft6in with 4 in depth, then heigth is 2ft6in and B is 2in. with the depth of 6in. The belt is end to en

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1/3 + (-5/6) + (-1/2) OK I have no idea about these at all. The parenthesis are actually "longer" than a normal parenthesis. I have read all about these and nothing is sinking in for some reason, can someone help me please? I Need help with understanding the Bondary line of a graph.
Like for this problem -x+4y<-4.

Also, when you have a fraction like 2/3 you go up 2, but how do you know to go left or right?

HELP ASAP!