rae built a gate for her backyard. the height of the gate is 3 feet and the width is 5 feet. about how long is it's support piece that goes along the diagonal? i will report if it’s a fake answer

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