The following section will discuss why some teenagers wear makeup to school. Is this sentence a strong claim or a weak claim?

Weak

Explanation:

"The following section will discuss why some teenagers wear makeup to school."

This does not have very much emotion and not not claim something strongly. It is simply a statement.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.