Expressions and Their Applications

Mrs. Zia's lesson focuses on writing, evaluating, and finding equivalent expressions with rational numbers. Students learn to create and compare expressions to understand their structure and application in real-world scenarios. The lesson includes exercises on comparing cell phone plans and calculating costs at a concession stand, emphasizing the use of expressions to make informed decisions.

What is the primary focus of lesson 18 in module 2?

• Learning about historical events

• Understanding geometric shapes

• Writing, evaluating, and finding equivalent expressions with rational numbers

• Solving equations with rational numbers

Which of the following best describes an expression?

• A statement with an equal sign

• A paragraph of text

• A combination of numbers, variables, and operations

• A list of numbers

For Company A, what is the expression to calculate the total cost if X is the number of phone lines, Y is the number of texting lines, and Z is the number of internet lines?

• 70 + 20X + 15Y + 15Z

• 90 + 15X + 10Y + 20Z

• 200 + 10X

• 50 + 25X + 20Y + 10Z

In the scenario where four people want phone lines, texting, and two need internet, which company offers the cheapest plan?

• Company B

• All are the same

• Company A

• Company C

Why do expressions not have an equal sign?

• Because they are always incorrect

• Because they are too complex

• Because they are incomplete

• Because they are not equations

What is the minimum cost for Company C's plan?

• $150

• $200

• $90

• $70

What is the role of expressions in decision-making?

• They simplify all decisions to one option

• They are irrelevant to decision-making

• They help evaluate and compare different options

• They confuse the decision-making process

How much did the three friends spend at the concession stand if popcorn costs $6.50 and soda costs $4?

• $20.50

• $15.00

• $25.00

• $31.50

Which property is demonstrated by the expression 3 * (P + S) = 3P + 3S?

• Distributive Property

• Commutative Property

• Associative Property

• Identity Property

What is the expression for the total cost if each friend buys one popcorn and one soda?

• 3(P + S)

• P + S

• 3P + S

• P + 3S