exam Maths Puzzle Numerical Ability

can you tell me another way to write x (raised to 1/2 power)y(2/3 power)z(5/6 power) :this question is from a practice test for the compass exam x(1/2)y(2/3)z(5/6)

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If x = –3, what is the value of x^2 - 1 / x + 1 ? A population grows at a rate of 8% per year forever. The population starts at 100. What is the size of the population at the end of year n? ( for any integer n)