Help!! geometry

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Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

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?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.