Answer:
Step-by-step explanation:
let width=w
length=3w-1
area=w(3w-1)=310
3w²-w-310=0
3w²-31w+30w-310=0
w(3w-31)+10(3w-31)=0
(3w-31)(w+10)=0
w=-10(rejected),31/3
length=31/3×3-1=31-1=30
length=30 ft
width=31/3 ft=10 1/3 ft
