book Maths Puzzle Numerical Ability

Express as a single logarithm and, if possible simplify
log(x^3-8)-log(x-2)

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book Other Question

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Solve Equation.

2log2 (x+6) - log2 16 = 2 Suppose that one solution contains 50% alcohol and another solution contains 80% alcohol. How many liters of each solution should be mixed to make 10.5 liters of a 70%-alcohol solu