Final answer:
The taxi driver will earn $10.80 for the first passenger who travels 4.8 miles and $19.58 for the second passenger who travels 7.3 miles.
Step-by-step explanation:
To calculate how much the taxi driver will earn for each passenger, we need to multiply the distance traveled by the rate per mile and add the flat fee.
For the first passenger who travels 4.8 miles, the earnings will be:
Earnings = (Rate per mile x Distance) + Flat fee = ($2.25 x 4.8) + $4.00 = $10.80
For the second passenger who travels 7.3 miles, the earnings will be:
Earnings = (Rate per mile x Distance) + Flat fee = ($2.25 x 7.3) + $4.00 = $19.58