Here are two expressions that represent the amount of money Erica saves compared to any amount she spends, where "X" represents the amount she spends:
1. Savings as a Difference:
Erica's savings compared to her spending can be represented as "Savings = X - Spending." This expression calculates the difference between the amount she spends (X) and the amount she saves.
2. Savings as a Percentage:
Another way to express the relationship is through a percentage. You can calculate Erica's savings as a percentage of her spending with the expression "Savings = (Savings / X) * 100%." This expression shows her savings as a percentage of her total spending (X).