exam Maths Puzzle Numerical Ability

j^2-9jk-10k^2

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exam Other Question

Find the angle between two vectors (5,2) and (-2,5) A bag of nickels, dimes, quarters and loonies contain 55 coins with a total weight of 130, worth a total of $12.50. If dimes weigh 1, nickels weigh 2, quarters weigh 3, and loonies weigh 4, how many coins of each type are there?