Question

An expression can often be used to model a real-life situation. For each of the following expressions, write a real-life situation using money as the context. Then, evaluate the expression and interpret the result in terms of the situation. Here's an example.

The following situation is modeled by the expression -24.50 + 100.00: Jonathan overdrew his checking account by $24.50. He then transferred $100.00 from his savings account to his checking account. His new checking account total is $75.50.

Make sure to use complete sentences in your answers.
1) $8.15 + $11.99
2) $20 - $18.04
3) 7($1.45)
4) 42.08 / 4

Answer 1

Real-life situations involving money can be modeled using basic arithmetic operations: adding money for a combined purchase, subtracting money to find change, multiplying for total costs of multiple items, and dividing to share costs among friends.

Step-by-step explanation:

Let's explore a few real-life situations involving money, where basic arithmetic operations come into play:

1. Adding money: Imagine you are at a coffee shop and you purchase a latte for $8.15 and a pastry for $11.99. The expression $8.15 + $11.99 represents the total cost of the latte and the pastry combined. When you add these two amounts, the result is $20.14, which is the total amount you would spend at the coffee shop.
2. Subtracting money: If you have $20 in cash and you buy a book that costs $18.04, the expression $20 - $18.04 represents the change you would receive after the purchase. Evaluating this expression, you would get $1.96 back in change.
3. Multiplying money: Let's say you want to buy 7 identical keychains as gifts, each priced at $1.45. The expression 7($1.45) represents the total cost for all keychains. By multiplying 7 by $1.45, the total cost comes to $10.15.
4. Dividing money: If you and three friends are sharing the cost of a gift that is $42.08, you would divide the total cost by 4 to find out how much each person should contribute. The expression 42.08 / 4 helps you find that each person should pay $10.52 towards the gift.