k = 2^n + 9, where n is an integer greater than…

k = 2^n + 9, where n is an integer greater than 1. If k is divisible by 9, which of the following MUST be divisible by 9?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #36775