exam Maths Puzzle Numerical Ability

rewrite as a single logarithm
5/6log2(x)+2/3log2(y)-1/2log2(x)-log2(y)

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exam Other Question

what is radical 18 minus radical 2 Please help me translate this into a quadratic equation and solve.

The Hudson River flows at a rate of 3 miles per hour. A patrol boat travels 60 miles upriver, and returns in a total time of 9 hours. What is the speed of the boat in still water?