10. Kathryn is making a flag for her school's football team. She has 40 feet of trim to put around the edge of the flag. The graph shows the function for the width, w(x), the length, l(x), and the area,
A(x), of the flag. Write a function rule, A(x), for the area of the flag in terms of the given amount
of edging material
30
40
40
10
60
300
20