Using proportions, it is found that Sylvia needs to order 324 square feet.
The rule of three is:
1 square yard - 9 square feet
36 square yards - x square feet
Applying cross multiplication:
[tex]x = 9 \times 36 = 324[/tex]
Sylvia needs to order 324 square feet.
A similar problem is given at https://brainly.com/question/25824774