Evaluating Expressions with Rational Numbers

Miss Sweeney demonstrates how to evaluate variable expressions involving rational numbers. The video includes three examples: substituting T with 18, P with -1, and using Q, R, and S. Each example follows the order of operations to solve the expressions, highlighting the importance of correctly substituting and calculating to find the final answer.

What is the main focus of the video tutorial?

• Graphing linear equations

• Solving quadratic equations

• Evaluating variable expressions with rational numbers

• Understanding irrational numbers

In the first example, what value is substituted for T?

• 15

• 10

• 18

• 20

What is the result of the expression when T is replaced with 18?

• 14.6

• 18.4

• 15.6

• 20.4

In the second example, what value is substituted for P?

• 0

• 2

• 1

• -1

What operation is performed first in the second example?

• Addition

• Subtraction

• Multiplication

• Division

What is the final result of the expression in the second example?

• 15.5

• 13.5

• 14.5

• 12.5

In the third example, what is the value of R?

• 3

• 1

• 0

• 6

What is the first operation performed in the third example?

• Division

• Multiplication

• Exponentiation

• Addition

What is the value of Q squared in the third example?

• 6

• 18

• 36

• 12

What is the final result of the expression in the third example?

• 1

• -3

• -1

• 0