exam Maths Puzzle Numerical Ability

-|-a-b|
Evaluate each expression using a=-1,b=2 and c=-3

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how can i tell if a -674 is a interger or a whole number or a natural and are all numbers integers Can someone please help me understand this problem? Graph the solutions to the system of inequalities 3x + 8y (>=) 240, 9x + 4 (>=) 360, x(>=) 6, y(>=) 0. A corner point of the sol