Using a special discount, you download 15 songs for $10.68. The regular price of H song is a is $0.89. What is the percent of the discount? due tomorrow please hurry

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field