How did the Rosetta stone help historians understand hieroglyphics?

Explanation:

In the 19th century, the Rosetta Stone helped scholars at long last crack the code of hieroglyphics, the ancient Egyptian writing system. ... The decree on the stone is written in three ways: in hieroglyphics, which was used mainly by priests; in ancient Egyptian demotic, used for everyday purposes; and in ancient Greek.

The Rosetta stone translated heiroglyphics to other languages. That historians knew like Greek.

Explanation:

it's lower nubia : ) good luck