exam Maths Puzzle Numerical Ability

Solve the following linear programming model graphically and explain the solution result:

MAX: Z=110x1 + 75x2
subject to
2x1 + x2> or =40
-6x1 + 8x2< or =120
70x1

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exam Other Question
simplify:

(2x^3 + 3x^2 + 2x +2) + (x + 1) The product of two consecutive odd integers is 23 more than their sum. Find the integers