exam Maths Puzzle Numerical Ability

simplify (-1/3)divide 2 1/6x 3.9

square root 5^2 +2x 1062/-5

(ax-4x)+(18ax-5x)

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exam Other Question

Factor 11x^2 + 11xy + 13x + 13y Systems of equations can be solved by graphing or by using substitution or elimination. What are the pros and cons of each method?