Expressions and Cost Analysis

This video tutorial covers writing, evaluating, and finding equivalent expressions with rational numbers. It includes practical examples such as comparing cell phone plans and calculating costs at a movie concession stand. The tutorial also explains how to write equivalent expressions and evaluate them using given values.

What is the primary focus of Module 2 Lesson 18?

• Learning about historical events

• Understanding geometric shapes

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

• Solving quadratic equations

In the cell phone plan example, what does the variable 'X' represent?

• Number of phone lines

• Number of family members

• Number of internet lines

• Number of text messages

Which company offers the least expensive plan in Situation A?

• Company A

• Company B

• All companies have the same cost

• Company C

In Situation B, which company should John's family choose for the least cost?

• Company B

• Company A

• Company C

• All companies have the same cost

How much do the three friends spend in total at the concession stand?

• $35.00

• $20.00

• $25.50

• $31.50

What is an equivalent expression for 4 * (x + 2y)?

• 4x + 8y

• 4x + 2y

• 2x + 4y

• 8x + 4y

What is the result of evaluating the expression 5 * (3 - 4y) when y = 1?

• 5

• 0

• 10

• -5

What is the greatest common factor used to factor out the expression -3x + 12y?

• 1

• 4

• 2

• 3

What is the combined expression for 2x + 10x - 6y?

• 2x - 6y

• 10x - 6y

• 8x - 6y

• 12x - 6y

What defines equivalent expressions?

• Expressions that look identical

• Expressions with the same number of terms

• Expressions that evaluate to the same number for every substitution

• Expressions that use the same variables