Respuesta :
M(n) denotes Aiden's fee (in dollars) for his n^th drive on a certain day.
Then:
- M(8) is Aiden's fee for his 8th drive;
- M(4) is Aiden's fee for his 4th drive.
M(8)<M(4) means that 8th drive was less expensive than 4th drive.
Aiden earned less money for his 8th than he earned for his 4th drive.