Answer
Length: 12 feet Width:4
Explanation
To get the area of a rectangle you times the length by the width
It says the length of the wall is 4 feet longer than TWICE it’s width since 12 times 4 is 48 and 12 is twice the amount of 4 plus 4 feet it fits the requirements of this question
The square root is

Just square the top and bottom of the fraction.

and

so we have 12/16 and then we reduce to 3/4
<span> Do you mean this one? </span>∑
It is summation.