exam Maths Puzzle Numerical Ability

solve system of equation by graphing
x+2y=6
2x+y=9

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exam Other Question

In a recent survey, 66% of the community favored building a police substation in their neighborhood. If 14 citizens are chosen, find the probability that exactly 11 of them favor the building of the police substation. Factor and simplify: cos�x-sin�xcos�x