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For what values of b will f(x)= logbx be a decreasing function? (16 )

Ineed if you could explain and give me the answer you! this needs done

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?