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