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Keiko is a software saleswoman. her monthly salary is $1800 plus an additional $90 for every copy of history is fun she sells. let S represent her total salary this month (in dollars), and let N repre
Keiko is a software saleswoman. her monthly salary is $1800 plus an additional $90 for every copy of history is fun she sells. let S represent her total salary this month (in dollars), and let N represent the number of copies of history is fun she sells. write an equation relating S to N.