What is the value of a circulated 1957 silver certificate serial number Q97832099 A?

A bill's serial number doesn't usually affect its value or help ID it. What matters is the date, seal color, and what letter if any is right next to the date.

In your case, circulated 1957 silver certificates are so common among collectors that they're usually only worth $1.50 to $2.00 at retail. A dealer will pay $1.00 to $1.50 depending on condition.