I am stuck help! You are building a rectangular garden against the back of your house, using 80 feet of fencing. The area of the garden needs to be greater than 400 square feet but less than 600 square feet.

A rectangle is labeled house. A similar size rectangle is labeled backyard. A smaller rectangle inside the backyard is labeled garden.

Which interval(s) represent possible lengths, in feet, for the horizontal edges of the garden?