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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Please help me. Graph the function f(x)=2x - 1 for values of x where -1≤ x ≤4 (show all working) A retailer spent $48 to purchase a number of special mugs. Two of them were broken in the store,but by selling each of the remaining mugs for $3 above the original cost per mug, sh