9) Sam had 7 days to complete 150 math problems. He had 5 hours a day to work on these problems. What is the minimum number of problems he needs to complete per hour?

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