Answer:
Width = 18
Length= 39
Step-by-step explanation:
side 1 = w (width)
side 2 = w (width)
side 3 = w+21(length)
side 4 = w+21 (length)
total= 114
above gets turned into 4w + 42 = 114
subtract 42 from each side to get
4w = 72
72/4=18
w=18
so plug that in to what we started with
Width = 18
Length= 39