Answer:
18 fence posts.
Step-by-step explanation:
The dimensions of the garden are given as :
Length = 5 feet
Width = 4 feet
As Crystal plans to put a post at each corner and at every foot, so we will find the perimeter of the rectangle or fence.
Perimeter =[tex]2(5+4)[/tex]
= 2*9 = 18 feet
So, 18 fence posts will be required.