Best uni for MS Data Science

Do Professional LOR’s require any stamp from the company?

Do we need to get the lor sealed / stamped or is it not required and can we submit a pdf?

If (x^3+y^6) is positive, which of the following must be true? (GMAT Quants)

If (x^3+y^6) is positive, which of the following must be true? A) x is positive B) y is positive C) x^3

Which one is better option UIC MIS VS University of Houston -Main Campus, MIS

If anyone can help me with deciding which one is the better option. As I had applied through UIC global my admission is

Can anyone Suggest me a good University for MS in Business Analytics in the US?

GPA - 7.9 (TIER 2 COLLEGE) GRE - 313, AWA -4TOEFL - 95+ ( EXPECTED)