Creating a range of value leads to the illusion of a. Negative space b. Positive space c. space d. Form

Positive space or Space

Explanation:

Value actually create a light, it basically have to create illusion of shadows and highlights.

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.