Answer:
D
Explanation:
The answer is D because you plug the N side into the N^2+4 side.
d. 85, 68, 40
n^2 + 4
9: 9^2 + 4 = 81 + 4 = 85
8: 8^2 + 4 = 64 + 4 = 68
6: 6^2 + 4 = 36 + 4 = 40
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