Gary's is a small publishing company that publishes math books. the production costs include a one-time cost for editing the book, which is $1,050 for the book the company is currently working on (the universe of math). once the book is in production, the only cost will be the variable cost of printing, which is $15 per book. the company will market the book at a price of $35. what equation represents the profit earned by selling x books?