These rectangles are similar, what is the scale factor?

The scale factor is either 1/3 or 3/1 depending on how you see the shapes in relation to each other.

Step-by-step explanation:

XW~RQ

15/5 = 3/1

5/15 = 1/3

This can differ depending on whether you see it as a transformation or not. Hope this helps :)

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.

so, converting firstly the mixed fractions to improper fractions and then "adding".