exam Maths Puzzle Numerical Ability

x^3 - 4x^2 - 21x = 0

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exam Other Question

a recipe calls for 3/4 of a pound of sausage. How much sausage should be used if only 1/3 of the recipe is being made. Write the answer in simplest form. B is between A and D. C is between A and D. AB + BD= AD. AC+CD=AD AD+AC+CD. AB=BD=AC+CD. Complete the proof