exam Maths Puzzle Numerical Ability

Find the maximun value of z=3x +2y subject tothe contraints x>=0, y>=0, x+2y<=4, x-y<=1

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exam Other Question

Alright well the directions say "For the given value of a, find -a and the absolute of a" and the first problem is a=6 what would i do to find -a and the absolute of a?

Please&thanks.
Please help factor completly 128x^3-54