Prefixes and Suffixes

Which one of the following can be added to the word 'credible' to form a new word ?

Choose the appropriate prefix to make the new word. Content

Choose the appropriate suffix to form new word: Trust

Choose the appropriate prefix to make the new word: Colon

What prefix would you add to the root word 'view' to indicate that you see something before other people do ?

If you take away the prefix and the suffix,what word is left of the word 'unemployed' ?