The population last year was 1,320,000,000. This year the population is 4,999,635,444. Which is the best estimate of the total population of last year and this year?

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge