This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise Find f. f ''(t)

The skip-able parts of the question are those which can be left without answering. If you skip a part of the question you may return to it later. There are few assignments in which once you skip a part of question you may not return to it again.

Explanation:

The question needs to be answered in sequence and skip-able parts of the question has given a choice to leave the part unanswered. There can be alternative questions available for skip able parts. If you skip a part of the question you may return to it later. There are few assignments in which once you skip a part of question you may not return to it again.

answer; presidential election years;