Find All Fixed Points for the Function by Setting the Function

Multiple Choice

Find all fixed points for the function by setting the function equal to x and solving the resulting equation for x.
-A rectangular garden has dimensions of 22 feet by 13 feet. A gravel path of equal width is to be built around the garden. How wide can the path be if there is enough gravel for 564 square feet?

A) 8 feet
B) 6 feet
C) 8.5 feet
D) 7 feet