I need help with BEGINNING Pre Calc. Stuff, Asap. ?

Question

10 points to the person who can kinda tell me whats going on with a right answer.

Express the area A of a rectangle as a function of the width W if the length of the rectangle is twice its width.

A( )=

Thank you for your help.

Answer 1

area=length*width. since the area is twice as long as wide it is a=l*2w

Answer 2

The area of a rectangle is the width times the height, so A=l*w

since the length is twice the width, l=2*w.

So A=2*w*w=2*w^2