You can
put this solution on YOUR website!In order to solve this problem you need to determine the perimeter of the rectangle.
the equation of the perimeter of a rectangle is P=2L+2W
W=25 feet
L=45 feet
2(25)+2(45)=50+90=140 ft to determine how many posts she needs you need to take the perimeter and divide by 5 since a post will be set every 5 feet 140/5=28 posts needed.