I think the awnser would be 2/28
Answer:
![\large \boxed{{r=\frac{1}{9}}}](https://tex.z-dn.net/?f=%5Clarge%20%5Cboxed%7B%7Br%3D%5Cfrac%7B1%7D%7B9%7D%7D%7D)
Step-by-step explanation:
x and y are proportional.
![y=rx](https://tex.z-dn.net/?f=y%3Drx)
Let x = 45 and y = 5.
![5=r(45)](https://tex.z-dn.net/?f=5%3Dr%2845%29)
Solve for r (constant of proportionality).
Divide both sides by 45.
![\displaystyle \frac{5}{45} =r](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B5%7D%7B45%7D%20%3Dr)
Simplify and switch sides.
![\displaystyle r=\frac{1}{9}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20r%3D%5Cfrac%7B1%7D%7B9%7D)
2. 5, 10, and 20 are factors of 20 that are not also factors of 12.