exam Maths Puzzle Numerical Ability

Solve the system by addition.
5x � 4y = �5 x � 2y = �7

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exam Other Question

let f(x)=x^3-8x^2+17x-9. Use the factor theorem to find another solution to f(x)-f(1)=0, besides x=1 Simplify: no negative exponents or decimal answers
(-2r)^4/(-2r)^-2