The Sino-Tibetan language family has over 400 languages, and is the second largest family next to the Indo-European. It's early languages were Sinitic (Chinese), Tibitec, Karnic, Bodo-Garo, Kuki-Chin, Meitei, Tamangic, Bai, Jingpho-Luish, and Lolo-Burmese, but has 400+ languages/major dialects being used modernly.
There is not a specific date to this but the first earth day was on april 22 1970
A(x,y) b(x,y) slope is y-y\x-x
so Ay-BY/AX-BX
d-0\0-d
d/-d=-1
Its Malay
<span>Who is the main character of the novel Blood On The Adoption (Tier 2) (Literature)
Datuk Bahaman / Zahid?</span>