Final answer:
Mrs. Sinclair's weekly salary last year was calculated by dividing her annual salary by 52.
Step-by-step explanation:
To find Mrs. Sinclair's weekly salary last year, we need to divide her annual salary by the number of weeks in a year. There are 52 weeks in a year, so we divide $888,441 by 52 to get her weekly salary.
Dividing $888,441 by 52, we get $17,084.63. Rounding to the nearest cent, her weekly salary last year was $17,084.63.