Good Riddles

Question: What exponents other than the same two numbers with the numbers one thru ten can be flipped and have the same answer?

Question: If 1+1=2, 2+2=8, 3+3=18. What does 4+4=?

Question: There are two persons. One is dead and one is still breathing. The dead one is called dead person. What did the other person call?

Question: If we breathe oxygen in morning what do we breathe at night?

Question: What four related words are merged together: TOUS RGQC URRO IAAN RLGS EEET ENE