1) Why did you change from to ? The answers should be .

2-6) ok

7) ok, but I would add this step: between "y = 6" and "y = 2-4" so that there is no confusion.

8-10) ok

11) you forgot the "twice the width" part. If you let the width = x, then the length would be 2x + 2. So the equation would be

.

EDIT: Added #11