Caitlin is painting her bedroom. She paints 42 square feet in 23 hour. At this rate, how many square feet can she paint in one hour? plz hlp asap

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