Question 536693
Area =	91	sq. 	miles												
Length  	=		x	miles											
Width 	= x	-6
Area =	x	*	(x	-6)
91	=	x^2	-6x			
x^2 	-6	x	-91	=	0	

x^2-13x+7x-91=0
x(x-13)+7(x-13)=0
(x-13)(x+7)=0
x= 13 OR -7

Ignore negative value
Length =13 & width = 7miles