Jonzza Q1 - 4 part 'answer' - give us your answers?
1) What happens to the speed of sound as you increase altitude?
2) What then happens to your 'speed' at a fixed Mach number " ---"---?
3) What happens to IAS at a fixed TAS as you "---"---"?
3) What happens to AoA as IAS reduces?
Not sure I understand what Q2 is seeking.