Book Maths Puzzle Log and Antilog

Expand as much as possible log(10,000x).

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Book Other Question

What is 6/7 of 50?

How do you do this problem?
The regular price of a pair of jeans is x dollars. Let f(x) = x - 5 and g(x) = 0.6x. Find (f o g)(x) and describe what this models in terms of the price of jeans.