The is the muscle in your arm that straightens your fingers. Femur

bicep

trapezius

Extensor Digitorum

Several muscle groups cross over the elbow joint. The muscles involved in flexion (bending) the elbow are the biceps brachii, brachioradialis and the brachialis. The triceps are responsible for elbow extension (straightening the arm).

Explanation:

answer; i believe the correct answer to be (trial films);

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.