How do i answer these please (last 2 are the same question)

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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

Which graph represents the equation y =4x