Question

The length of a rectangle is twice its width
The perimeter of the rectangle is 43cm

Answer 1

7.17 cm

Explanation:

If the width is x, the length is twice this = 2x

And

Perimeter = 2 (W + L)

so

Perimeter = 2 ( x + 2x)

Perimeter = 2 (3x)

Perimeter = 6x

43 = 2 ( x + 2x )

43= 2 ( 3x)

43 = 6x

= 7.17 cm

Hope this helps i'm pretty sure this is how you do it :-)