exam Maths Puzzle Numerical Ability

Graph each inequality.

2x - y + 3 is greater than or equal to 0

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exam Other Question

the sum of two numbers is 156 there product is 900 Factor completely:
12x^3 - 3xy^2

If I am not mistaken in my own math I believe the answer is:

3x(4x-y)(x+y)

Is this correct? Thank you