Are the irrational numbers closed under multiplication?

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

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

Can someone me with the property questions for 12 13 and 14 plz