Evaluating Expressions and Formulas with Substitution

What does it mean to evaluate an expression?

• To simplify it

• To solve it

• To rewrite it

• To ignore it

What is the first step in evaluating the expression b + 18 if b equals 3?

• Multiply b by 18

• Add 18 to b

• Subtract 3 from 18

• Substitute 3 for b

What is the result of evaluating the expression b + 18 when b equals 3?

• 24

• 21

• 18

• 15

In the expression 4a, what does the 4 represent?

• A constant

• A coefficient

• An exponent

• A variable

What is the result of evaluating the expression 4a / c when a equals 10 and c equals 5?

• 10

• 8

• 20

• 2

What is a formula in mathematics?

• A mathematical expression describing a rule or relationship

• A variable

• A number

• A constant

What is the formula for the surface area of a cube?

• s^2

• s^3

• 6s^2

• 6s

What is the result of evaluating the formula 6s^2 for a cube with side length 4?

• 128

• 96

• 64

• 48

What should you always remember to do when solving expressions and formulas?

• Use a calculator

• Guess the answer

• Show each step

• Skip steps

What is the final answer for the practice problem with the values 8.5 and 3?

• 27.5

• 24.5

• 25.5

• 26.5