What is the value of the expression (0.4)2

Given the following statements, which is the best

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?

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5