Answer:
A) it makes a verb an adjective
Explanation:
It makes the verb an adjective because if you have "fast" and put in "-er" you'd get "faster". Faster would mean going more vigoriously than before, therefore describing the speed of "fast"
Answer:
I think the answer is Mr. Culpepper wants to help his students but does not know how to do it
This happens quite a lot in verbs e.g run to running. It is because you double the last consonant in a one-syllable noun for it to become a verb. (Keep in mind there are exceptions to this rule.)