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Komok [63]
2 years ago
13

I need help to solve this

Mathematics
1 answer:
-BARSIC- [3]2 years ago
3 0

Step-by-step explanation:

(6+r)^2 = 81 + r^2

36 + 12r+ r^2 = 81 + r^2

12r = 81-36 = 45

r = 15/4 = 3.75

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