the area of a rectangular living room is 300 square feet. the length of the room is 10 feet less than twice the width

The length is 20, and the width is 15.

Step-by-step explanation:

You have to write an expression to represent this situation. w can be the width, and the length can be 2w-10. To fnd the area, you multiply these together. w (2w-10) is 2w^2 - 10w. From there, 15 is the only value of w that satisfies the equation, so w=15. Substitute 15 into your expression for lngth, and 2 (15) - 10 is 30-10 is 20, so the length is 20.