book Maths Puzzle Numerical Ability

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?

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book Other Question
The decibel level of sound is given by D= 10log ( I/10^−12), where I is the
sound intensity measured in watts per square meter. Find the
decibel level of a whisper at an intensity of 5.4 × 10-10 watts per 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