<PRE><B>Question 387184</B>
S = 25x + 100 Rock CD 
S = -50x + 475 Rap CD 
where x represents the number of weeks each CD was in stores, with x = 0 corresponding to the CD sales on the day each CD was first released in stores. 
After how many weeks will the sales for the two CDs be equal?
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Solve:
25x+100 = -50x + 475
75x = 375
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x = 5 weeks
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Cheers,
Stan H.</PRE>