exam Maths Puzzle Numerical Ability

my problem is for pre-algebra for order of operations

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

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exam Other Question

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

{x + y <=6
{0 <= x <= 4
{0 <= y <= 4 Find the x- and y-intercepts of x + 3y + 2 = 0 and use these intercepts to graph the equation.