Solve the word problem

Question

Each key on a piano produces a frequency that is 2^1/12 times higher than the frequency of the key immediately to its left. Moving n keys to the rights of any key increases the frequency of the starting note by a factor 2^n/12. The key corresponding to Concert A has a frequency of 440nHz. What is the frequency of note D, which is 5 keys to the right of Concert A?

Answer 1

440(2^5/12) = 587nHz