# Function notation word problems

### Problem

Aiden is a taxi driver.
M, left parenthesis, n, right parenthesis models Aiden's fee (in dollars) for his n, start superscript, t, h, end superscript drive on a certain day.
What does the statement M, left parenthesis, 8, right parenthesis, is less than, M, left parenthesis, 4, right parenthesis mean?