book Maths Puzzle Numerical Ability

I need to write the following in exponential form. What does this mean?
^3 square root of x^2y^3

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book Other Question

write the expression as a single logrithm

log5 (x(squared - 36) - 8log5 (x+6) = log5 _____ . fill in the space at the end
If x/y=4/7 and y/z=14/3.What is the value of [x+y]/z? could you solve this?