Final answer:
The radio transmission 10 code that means 'request fire truck at location' is 10-4.
Step-by-step explanation:
The radio transmission 10 code that means 'request fire truck at location' is 10-4. In radio communication, 10-4 is commonly used to indicate that a message has been received and understood. Therefore, when emergency services personnel use the code 10-4, it means that they have received the request to send a fire truck to a specific location.