Answer:
D. 21
Step-by-step explanation:
replace 21 for r, 4(21)=84
Hope this helps! If you found my answer helpful, please consider marking me brainliest. Thank you!
Hope this helps!
Because in order to find r, you need to divide both sides by 4 to get r = 21.
So that means there will be 21 rhinestones on each backpack.
-3/12
