Becky is building a square rabbit cage. the length and width are both 3 feet less than the square dog pen she built for her dog. the area of the rabbit cage is 25 ft.
a. using d to represent the side of the square dog pen, write an expression to represent the area of the rabbit cage.
b. use the expression and the given area to find the length of a side of the square dog pen.
c. how many feet of fencing is needed to enclose the 4 sides of the rabbit cage? (show work)