exam Maths Puzzle Numerical Ability

The newspaper said that only 42% of the registered voters voted in the school board election. If 11,960 people voted, how many registered voters are there? Write an equation.

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The problem says: Find all zeros of: {{{ Q(x)=x^6-4x^5+5x^4-x^2+4x-5 }}}. I used Decartes Rule of Signs, Rational Zeros Theorem, and synthetic division to find that x=-1 and x=1 Michael purchases a rare coin for $100 that will double in value every 9 years. His friend John purchases a rare book for $75 that will double in value every 6 years. If both purch