9 4/5 divided by 5 8/11

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd