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C is the correct answer. It can’t be D because negative can’t be under radical.
Hope this helps!
Answer:
C
Step-by-step explanation:
Write "st div. by 6r" as
st
-------
6r
45s 15s 3s
If r =5 and t = 45, but s is unknown, then we get --------- = --------- = -------
6(r) 2(5) 2
