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 space of 209 square feet is allocated for the living and dining areas in an apartment. Find the width of the square living area given that the width of the dining area is 8 feet.
$$\text { Total Area: } 209 \text { square feet }$$

A) 19 feet
B) 13 feet
C) 10 feet
D) 11 feet