exam Maths Puzzle Numerical Ability

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Multiply:

(sqrt[3] + 2sqrt[5])(6sqrt[3] - sqrt[5])

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exam Other Question

A motorboat has a four-hour supply of gasoline. How far from the marina can it travel if the rate going out against the current is 20mi/h and the rate the rate coming back with the current is 30mi/h? find the slope of a line that contains the points (-3,4) and (-1,-8).