Help its a test

B

Step-by-step explanation:

well there’s an easy way to do this. if i explain it it’ll be easier to understand where i’m coming from.

See all we have to do, is take the 12.50 and subtract it from 71.. which you would get 58.5.

now all we have to do is count up to 58.5 by 4.5

if you do that long enough you get 18.5 so r is 18.5

amd there you have your answer. if you did it by A, it would’ve taken a lot longer and been much more difficult