Final answer:
The correct expression for the taxi fare at a rate of $0.50 per mile for m miles is 0.5m.
Step-by-step explanation:
The expression that describes the taxi fare of $0.50 for each mile, represented by m, is 0.5m. This is because the total cost of the taxi fare can be found by multiplying the number of miles traveled (m) by the cost per mile ($0.50). Therefore, if a taxi charges $0.50 for each mile traveled, and you travel m miles, the total fare would be 0.5 multiplied by m, which is written algebraically as 0.5m.