Answer:
[tex]\dashrightarrow\:\:\sf Area \: of \: Rectangle = Length \times Width \\ \\ \dashrightarrow\:\:\sf Area \: of \: Rectangle = (x - 5)(x) \\ \\ \dashrightarrow\:\:\sf Area \: of \: Rectangle =(12 - 5)(12) \\ \\ \dashrightarrow\:\:\sf Area \: of \: Rectangle = 7 \times 12 \\ \\ \dashrightarrow\:\: \underline{ \boxed{\sf Area \: of \: Rectangle = 84 \: {ft}^{2} }}[/tex]
Hence, option (B) 84 sq.ft is the right answer. ✔️
