Jenny is building a rectangular garden around a tree in her yard. the southwest corner of the garden will be 2 feet south and 3 feet west of the tree. the northwest corner of the garden is 1 foot north and 4 feet east of the tree. what will be the perimeter of jenny's garden ?
a. 10 ft
b. 20 ft
c. 21 ft
d. 25 ft

There are numerous important information's already given in the question. Based on those information's the answer can be easily determined. From the information's given, we get the coordinates as (-3, -2) and (4, 1). From these co ordinates, we can say that
Height of the rectangle is 3 feet
Length of the rectangle is 7 feet
Then
Perimeter of the rectangle = 2( length + Height)
                                          = 2(7 + 3)
                                          = 2 * 10    
                                          = 20 feet
From the above deduction, we can conclude that the correct option is option "B".