Van eyck and his brother discovered how to mix pigments with binders like linseed oil to perfect the use of a. plaster for frescoes. b. oil paints. c. canvas primers. d. egg tempera.

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.