book Maths Puzzle Numerical Ability

If I know the length of two sides of a triangle, how do I find the length of the third side?

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book Other Question

George saves nickles and dimes for tolls. If he has 28 coins worth $2.60, how many are nickles and how many are dimes? I need a Formula for the Distance from a Point (p,Q) to a Line Y=MX+b.