two pages double

Kellogg 1
"Briefly assess your career progress to date.  Elaborate on your future career plans and your motivation for pursuing a graduate degree at the Kellogg School. (One to ) "

1.不是可以网上交ESSAY么?为何还要用two pages double-spaced格式?
2.难道要upload PDF/WORD格式?
3."two pages double-spaced"大概有多少字?10号字吧
谢谢!!!