Explain why you add to find the sum of two negative integers, but subtract to find the sum of the positive and negative integer. Use a number line or counters in your explanation?

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