Final answer:
The number that is between 7.1×10^3 and 71,000,000 on a number line is 7,100.
Step-by-step explanation:
The number that is between 7.1×10^3 and 71,000,000 on a number line is 7,100.
This is because when we write 7.1×10^3 in standard notation, it is 7,100.
So, the number 7,100 is between the two given numbers.