Melinda spent 4 hours reviewing for her midterm exams. she spent 1/4 of the time studying for social studies. how many hours did she spend on social studies

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