Respuesta :
Answer:
D. 21
Step-by-step explanation:
replace 21 for r, 4(21)=84
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Answer:
D. 21
Hope this helps!
Step-by-step explanation:
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.