Evaluating Basic Algebraic Expressions

A variable is a

• number

• letter that represents a number

Name the variable: 20 - 2x

• 20

• 2

• x

• a

Evaluate m - n if m = 29 and n = 11

• 29

• 18

• 11

Which of the following expressions contains a variable?

• 7+3

• 144÷12

• 7 + 15n

• 6(5)

Evaluate n³ if n = 5.

• 15

• 125

Evaluate 7a - 6 if a = 3.

• 15

• 67

Evaluate 9b + 15 if b = 3.

• 42

• 108

Evaluate 3m if m = 4.

• 3

• 5

• 12

• 15

2x + 3 + x²; for x = 4

• 17

• 27

• 19

• 25

Evaluate when x = 8:
2x + x - 10

• 34

• 22

• 14

• 24