The o'neill shoe manufacturing company will produce a special-style shoe if the order size is large enough to provide a reasonable profit. for each special-style order, the company incurs a fixed cost of $1000 for the production setup. the variable cost is $40 per pair, and each pair sells for $50. let x indicate the number of pairs of shoes produced. develop a mathematical model for the total cost of producing x pairs of shoes. express your answer in terms of x.