Evaluating Expressions and Coefficients

This video tutorial covers the evaluation of algebraic expressions by substituting given values for variables. It explains how to handle expressions involving decimals and fractions, and introduces the concept of coefficients. The lesson concludes with a brief overview of the next topic, which involves using the order of operations to evaluate expressions.

What is the process of finding the value of an expression by replacing variables with numbers called?

• Substitution

• Calculation

• Evaluation

• Simplification

In the expression n + 4, if n equals 6, what is the result?

• 12

• 14

• 10

• 8

What operation is performed in the expression 20 over x when x equals 4?

• Division

• Multiplication

• Subtraction

• Addition

If x equals 4, what is the value of 20 divided by x?

• 4

• 7

• 5

• 6

In the expression 0.2a, if a equals 1.3, what is the result?

• 0.13

• 0.26

• 0.39

• 0.52

What is the result of multiplying 0.2 by 1.3?

• 0.26

• 0.52

• 0.13

• 0.39

In the expression 8y, if y equals 1/5, what is the result?

• 1.5

• 1.8

• 1.6

• 1

What is a coefficient in an algebraic expression?

• A variable

• A constant

• A number multiplied by a variable

• A divisor

Which of the following can be a coefficient?

• Only positive numbers

• Positive or negative numbers, including fractions and decimals

• Only negative numbers

• Only whole numbers

In the expression 5n, what is the coefficient?

• n

• 10

• 15

• 5