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Find the perimeter of a rectangle whose adjacent sides are 3x -5y-4z and x-3y+5z.

By Aubrey

Find the perimeter of a rectangle whose adjacent sides are 3x -5y-4z and x-3y+5z.

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Aubrey

A ball is thrown in the air. Its height at any time t seconds is given by metres.

Using differentiation, work

Three pumps working 8 hours a day can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?​

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