Width = x then length = 2x
2x * x = 18
x^2 = 18/2 = 9
x = 3
So the width = 3 feet and the length = 6 feet.
The answer that is correct is 20 so there you go
It should be the 3rd one
A function can only have ONE answer
E.g. y = a (correct)
y = +/-a (incorrect)
The strategy is called expanding notation.
