Answer:
The length of the rectangle is 6 and the width is 12.
Explanation:
We start by listing the length as x and the width as 2x. Now we can find the value of each side by multiplying the together and setting it equal to 72.
2x * x = 72
2x^2 = 72
x^2 = 36
x = 6
Now we have the length. We can find the width by plugging it into the equation.
2x = width
2(6) = width
12 = width