Basic help :(
its math

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Simply 8x squared + 5(7x squared- x) - 2x =

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?