Please check this logarithm question...
The loudness level of sound can be expressed by comparing the sound's intensity to the intensity of a sound barely audible tot he human ear. The formula D = 10(log I - log I0) describes the loudness level of a sound. D, in decibels, where I is the intensity of the sound, in watts per meter^2, and I(0) is the intensity of a sound barely audible to the human ear.
a. Express the formula so that the expression in parentheses is written as a single logarithm.
b. Continued below...

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My Answers.
A. \[D=10*(Log(\frac{ I }{ I _{0} }))\]
B. D=20

Logarithm is a confusing topic. I am also equally confuse about the concepts.

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