exam Maths Puzzle Numerical Ability

Find the maximum value of C=2x+y on the region determined by the constraints:

{x + y <=6
{0 <= x <= 4
{0 <= y <= 4

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exam Other Question

Factor

10x^2y^5z-5x^5y^2z^5-10x^4y^4z^4
my problem is for pre-algebra for order of operations

1/2(25) how would you multiply 1/2 with the (25)