book Maths Puzzle Numerical Ability

The definition of the log function (y = logb N, where b>0,
b not 1) is based on the definition of the exponential function.
Explain why you cannot take the logarithm of a negati

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Hello I don't know how to find the dimensions with the perimeter given and how to find the answer to the second problem as well can you help me please?

Here is the word problem
Please help me solve this equation

y^3z^n(y^3^nz^3-4yz^2^n)