Mathematics, 24.06.2019 11:30 firefox1fan

Isaac downloaded 7 ringtones. each polyphonic ringtone costs $3.25, and each standard ringtone costs $1.50. if he spends a total of $21 on ringtones, find the number of polyphonic and standard ringtones he downloaded.

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Isaac downloaded 7 ringtones. each polyphonic ringtone costs $3.25, and each standard ringtone costs...