A good friend of yours
is planning to install a new concrete walkway around his backyard swimming
pool. The pool measures 25 feet long by 15 feet wide, and the width of the
walkway is to be the same all the way around. Your friend is trying to
determine how wide to make his walkway and needs your advice. 



1. Write a polynomial expression to model the square feet of concrete needed 

2. Determine how much concrete is needed if the walkway is:

a.) 4 feet wide

b.) 5 feet wide

c.) 6 feet wide



1.  Determine the price
for #2 - parts a, b, and c given that the price per square foot of concrete is
$25


2. Which sidewalk width
would you recommend for your friend and why?