Final answer:
More than four hundred languages used south of the equator belong to the Bantu branch of languages.
Step-by-step explanation:
The Bantu branch of languages is spoken in the southern half of Africa. According to the information provided, there are well over four hundred known Bantu languages spoken today across a large portion of the southern half of Africa. Therefore, more than four hundred languages used south of the equator belong to the Bantu branch.