Final answer:
Frannie worked approximately 7.5 hours yesterday at the veterinarian's office.
Step-by-step explanation:
To calculate the number of hours Frannie worked, we can use the formula:
Hours worked = Total earnings / Hourly pay rate
Using the given information, we can substitute the values:
Hours worked = $73.50 / $9.80
Solving this equation, we find that Frannie worked approximately 7.5 hours yesterday.