Question

A prefix is added to the of a word.

Answer 1

first one : beginning

Explanation:

Answer 2

Yes, it's correct. A prefix is a group of letters placed before the root of a word. For example unemployment, the root is "employ" "ment" is the suffix and the prefix added is UN which means (not). So, when you add the prefix it changes the meaning of the word, in this case to a negative word. Employ is a verb and  unemployment is a noum.