Question 842073
Hey!

Your length of the rectangle is 2 times the width.
Let length = 2x
Let width = x

Now your area = 450m^2

2x.x = 450 ("." means multiply)
2x^2 = 450
Therefore x^2 = 225
Therefore x= 15

If your x=15 , then you know your width.
Length = 2x (2 x 15 = 30)
Therefore:
Length = 30m
Width = 15m

Hope that helped! :)