book Maths Puzzle Numerical Ability

Translates the verbal expression into an algebraic expression.

Eight percent of a number

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book Other Question

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logbx^2y^3/z^4

I do not understand how to expand this. Could someone help me.

Thank you
hi need help w/the following
simplify the following expression
x^-1 - y^-1 /x^-1 + y^-1