How to find area of the base for a cube

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?