exam Maths Puzzle Numerical Ability

Find a value for k so that 9m squared - kn squared will have the factors 3m + 7n and 3m - 7n

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The portion of the company's fixed costs allotted to this product is $300, and the supplier's cost for a set of tile is $6 each. Let x represent the number of tile sets. If b repre When John F. Kennedy was Sworn in as President, he was 1 year older than Teddy Roosevelt was when Roosevelt took the office. If the sum of their when each became President was 85, how wold was Kennedy when he was sworn in?