exam Maths Puzzle Numerical Ability

The feasible region of a maximization problem shown is determined by:
12x+5y< or equal to 180
5x+4y< or equal to 98
x^3 0, y> or equal to 0

Which of the following objective f

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exam Other Question

Write 36x^2-360x-25y^2-100y=100 in standard form.

I know I am supposed to complete the square, but that is what I am having trouble with. Any help is very much appreciated! How many kilograms of coffee beans selling for $2.40 per kilogram should be mixed with 4 kilograms of coffee beans selling for $3.60 per kilogram to obtain a mixture selling for $2.88 per kilogram?