Answer: Gary mails 1,000 flyers.
Step-by-step explanation: 10^3 is equivalent to 1,000. Usually, in the rule of exponents with the base 10, the exponent is the number of zeros there should be after 1. For example, if we had 10^2, that would be equal to 100 because there are 2 zeros being added after 1.
Hope that helps!