Help please. I need help with the o+o=

I don't understand the last question. the very end.

if you have the answer I will mark brainlist
​

i like cardi bs album.

true because it is true

i'm not too sure - if you could attach the picture

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.