wow because i said "the two tigers" instead of just "two tigers" my answer is wrong??
Yes, because "the two tigers" would be 호랑이 두 마리는, not 호랑이 두 마리가, as "the" puts emphasis on the topic in this case.
호랑이 is the base form. This should demonstrate to you what I mean:
The 이 is a part of 호랑이 and not an affix. Another such word is 고양이, meaning cat.
Nope, because tiger in Korean is 호랑이 not 호랑. Just as cat is 고양이 and not 고양