Question

Which words contain an affix? Check all that apply.

strength
unhappy
inchworm
reread
restless
comfortable

Answer 1

Unhappy, reread, restless, comfortable. An affix is an additional word or elemnt attached to a word. For example Un-Happy. You are putting "un" in front of the word happy, making it unhappy

Answer 2

The correct answers are unhappy, reread, restless, and comfortable.

An affix is a term which refers to suffixes (parts of words added at the end) and prefixes (parts of words added at the beginning). So, if you take a look at the words above, you will see that unhappy has a prefix un-, reread has a prefix re-, restless has a suffix -less, and comfortable has a suffix -able.
The other options do not have affixes.