1 + 9 + 8 = 1, 2 + 8 + 9 = ?

Question: If 1+9+8=1, what is 2+8+9?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: What loses its head in the morning and gets it back at night?

Question: What two things can you never eat for breakfast?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?