Evaluating Expressions and Phone Plans

The video tutorial introduces writing and evaluating expressions using variables. It uses examples like cell phone plans and movie concession stands to explain how to calculate costs using expressions. The tutorial also covers evaluating expressions using PEMDAS and the distributive property, providing a comprehensive understanding of these mathematical concepts.

What is a flat rate fee in the context of cell phone plans?

• A fee that changes based on usage

• A fixed monthly charge regardless of services used

• A one-time setup fee

• A fee for international calls

In the expression for phone lines, what does the variable X represent?

• The cost per phone line

• The number of phone lines

• The total monthly fee

• The number of text messages

Which company charges a flat rate of $200 and an additional $10 per phone line?

• None of the above

• Company C

• Company B

• Company A

If a family chooses Company B with 4 phone lines, unlimited texts, and internet, what is the total cost?

• $180

• $150

• $220

• $200

How do you evaluate an expression using substitution?

• Ignore the variables

• Replace variables with their values and perform operations

• Add all numbers together

• Multiply all numbers together

What is the distributive property used for in expressions?

• To divide numbers

• To multiply a single term across terms inside parentheses

• To add numbers

• To subtract numbers

What is the first step in evaluating an expression using PEMDAS?

• Evaluate exponents

• Perform all multiplications

• Solve operations inside parentheses

• Perform all additions

In the expression 5x + 4y, if x = 2 and y = 3, what is the value of the expression?

• 26

• 22

• 10

• 23

What does factoring out a number in an expression involve?

• Dividing each term by the number

• Adding the number to each term

• Multiplying each term by the number

• Subtracting the number from each term

What is the result of evaluating the expression -3x + 12y when x = 5 and y = -2?

• 39

• 15

• -39

• -15