Answer:
width = 2.5 feet
Step-by-step explanation:
Suzanne has a rectangular garden which is 18 feet long and 11 feet wide.
Area of the garden = length times width = 18 times 11= 198 square foot
Let 'w' be the width of the border
Length of the garden with border = 18+2w
Width of the garden with border = 11+2w
Area of the garden with border = 
Area of the border = 
She has 168 square foot of paving stones,

Solve for w
apply quadratic formula
a= 4, b= 58 and c=-168



we get two values for w

