How do u write 30,270,904 in expanded form

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

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

Give another definition of variability and explain how it can be calculated.