In these sentences which verb should be chosen?

The public also views/view other sculptures at the memorial.

I think Views because public is plural?

Mathematics fail/fails to explain the wall's dramatic effect.

Fail?

5 answers

Views is correct -- but public views is singular.

Mathematics is also singular so takes the verb fails.

Think: He fails, They fail
Public is singular, a body of people.

You're right on the second one. Mathematics is also singular.
Yes, fails is right on the second one. I goofed.
What about this one?

Each of the walls halves are/is about 250 feet long.

I think is because each is one part
You're right. Each is singular. Each is.