book Maths Puzzle Numerical Ability

what is 0 to the 0 power?
what is y=(3/5)to the x power?
In the roots and fractional exponents,
what is the square root of 81 with a mini 4 on the top left side of the square root?

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book Other Question

Five divided by the sum of a number and 1, minus the quotient of 3 and the difference of the number and 1 is equal to 6 times the reciprocal of the difference of the number squared and 1. What is the number?
Could be 7, -1, -1/4, or 4 express as a single logarithm: ln7 + 1/2 ln9