If the root of a scale is D flat, the eighth note in the scale is:
А Е
B
D natural
D natural
C
D sharp
D sharp
D
D flat

The 8th note of the D-flat major scale is D-Flat

Explanation:

Sorry for the late help, i'm just waking up but you can plot out every note in the d-flat scale and you'd see it basically comes back full circle.

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