book Maths Puzzle Numerical Ability

Charles is x years old now. Express his age 12 years ago.

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book Other Question

I have a rectangle with sides 1, 1 and square root of 2. I need to find the angle between a diagonal and one of the long edges. I tried using trigonometry but making different kind What is the focus of the parabola with the equation {{{x=-(1/4)(y-3)^2-5}}}