If a publisher charges $15 for the first copy of a book that is ordered and $12 for each additional copy, which of the following expressions represents the cost of \(y\) books?

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This is an arithmetic sequence with first term 15 and difference 12.

$$ a_n=a_1+d(n-1) $$ $$ a_y = 15 + 12 (y-1) $$ $$ a_y = 15+12y-12 $$ $$ a_y = \boxed{12y+3} $$