exam Maths Puzzle Numerical Ability

solve

-6 < or equal to 3 + x < 4

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exam Other Question

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 solve the quadratic equation by completing the square

2x^2+10x+11=0