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Mathematics 10 Online
OpenStudy (anonymous):

! Ad revenue for an web service are about $2 a month per each free user. A monthly “premium” subscription costs $11 dollars for the month, but does not make any ad revenue. The first month showed that 690 users used the web service that month earning a total of $2,064 between ad revenue and subscriptions. Calculate the number of users of each type (free users, subscribers)

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