book Maths Puzzle Numerical Ability

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Wrtie as the sum or difference of single logarithms of x, y, and z

log(lowercase)8{(3x 3sqrt y) / z^5}

Note: the 3 is inside the

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15sqrt9 - sqrt9 You have a triangle with sides 6, 7 and x. What is the maximum that x can be and why?