Answer:
To determine how much money Marlow would have if he loses $20 each month for 5 months, you can use the concept of subtraction. Each month, Marlow loses $20, which is a negative change in his money. So, to find out how much money he has left after 5 months of losses, you can subtract the total amount lost from his initial amount of money.
Let M represent Marlow's initial amount of money.
After 5 months of losing $20 each month, Marlow's total loss would be:
Total Loss = $20/month * 5 months = $100
To find out how much money Marlow would have left, you need to subtract this total loss from his initial amount:
Money Left = M - Total Loss
So, Marlow would have M - $100 left after 5 months of losing $20 each month.