Is $9-6i$ a solution of the equation $$x^2-18x+117=0?$$

A) No
B) Yes

When it opened on Monday morning, a local delicatessen had 26.8 pounds of salami. During the week, it received a shipment of 84.9 pounds of salami. Also during the week, it used 42.8 pounds of salami in sandwiches and sold 34.2 pounds in bulk to retail customers. How much salami remained at the end of the week?