Question 866635
P = 168 (given perimeter)
W = 36 (given width)
L = unknown (we'll leave it as L for now)



P = 2*(L+W) ... perimeter of rectangle formula



168 = 2*(L+36) ... plug in L = 36 and P = 168, then solve for L (ie isolate it)



168 = 2*L+2*36



168 = 2L+72



168-72 = 2L



96 = 2L



2L = 96



L = 96/2



L = 48



The length of the field is <font color="red">48 feet</font>