exam Maths Puzzle Numerical Ability

7(3x + 4) + 8(2x + 5) + 13

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exam Other Question

Systems of equations can be solved by graphing or by using substitution or elimination. What are the pros and cons of each method? express as a rational expression:

x^3+y^3+z^3-3xyz/a^3+b^3+c^3-3abc times

a^2+b^2+c^2-ab-bc-ca/x^2+y^2+y^2-xy-yz-zx