Find the value of x

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Ineed i do not understand i'm only 8

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

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