What is the sum of the measure of the interior angles of an octagon

Find the sum to the equation 3+6+9+

Areal estate agent earns $32,000 a year plus $1,000 for each apartment he sells. write an equation that shows the relationship between the number of apartments abe sells,n, and the total amount he earns in a year,e. what is the total amount abe would earn from selling 10 apartments in one year

The measure of an angle is 117°. what is the measure of a supplementary angle?