I just need some advice my birthday is coming soon but i have to spend it at my dad's (i hat e him and he is abus ive)

and i have to spend all my birthday at his stup id house where i get abused 24/7

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