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"I am well," or "I am good."	This is a tricky question. "I am well." is a formal reply to the question " How are you?" However, there are many informal statements related to this question which are acceptable in normal conversation including "I feel good." Normally good is an adjective, a word which modifies a noun. "My health is good." Well is an adverb which modifies a verb "I paint well"; however 'well' is also noun describing health so in this sense "I am well" is acceptable
Does the noun *livestock* take a singular or plural verb? As in: Livestock [has/have] been important in serving humankind.	Collective nouns (groups of people and things) take a singular verb unless the individuals are to be emphasized. Livestock has been important in serving humankind. (singular) I chased away the livestock who were trampling my vegetable garden. (plural)
Which is correct: "proved" or "proven?"	According to my sources proved is more often correct especially in the US, however proven is indicated as in use in scientific and literary texts. I prefer proven myself.
Which is the correct usage of the word "effect" (or "Affect"): the paperwork necessary to EFFECT the assignment or AFFECT the assignment.	To "effect" means to "bring about or accomplish." It has a sense of completion. This would be the usage if the paperwork was necessary to complete the assignment. This is probably the correct usage in your case. To "affect" means to influence or change. This would be the usage if the paperwork had influence on the outcome or course of the assignment but was not a requirement for completion of the assignment.
Which is correct, "pre-approval" or "pre approval?" The sentence structure is "Pre-approval is required on..."	"pre-approval" is correct since the prefix "pre" can not stand as a word on its own.