Answer:
819
Step-by-step explanation:
to find the area of a shape you have to multiply lengths by width by height So Since this one is 7 ,13 and 9 multiply them together I think
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PEDMAS:Parenthesis
Exponents
Division/
Multiplication
Addition/
Subtraction

Multiply 99*99.

Subtract from Left to Right.
The Answer Is:

Hope this helps.
-Benjamin
Hey there! Please see attached pic. Hope this helps!
You get 158.667 yards of yarn
Explanation-You dived the length value by 3 since 3 feet = 1 yard