exam Maths Puzzle Numerical Ability

Can you please help me expand this set of numbers?
6x(2x-7)

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exam Other Question

How would you graph the solution set to the following system of inequalities?
y is less than 2x+2
y is greater than or equal to -x+3
i need help setting up this proof...
Given that alternate interior angles are congruent prove that alternate exterior angles are congruent