(r+10)/4 = r/5
A) -50
B) -1
C) 3.7
D) -1.902

So the right answer is A.
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Answer:
A
Step-by-step explanation:
(r+10)/4 = r/5
5(r+10) = 4(r)
5r+50 = 4r
5r-4r = -50
r = -50