Tempo markings at the beginning of a score indicate a mandated tempo that should not be changed throughout the entire piece.

a. true
b. false

True. The tempo should be maintained unless otherwise denoted (rit., rall., accel., etc.)

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.