Chapter 1 Variable_ZH

A variable represents what is ______________. 

• the answer
• the operation
• the difference
• unknown 

A variable is . . .

• an awesome number

• a number represented by a letter

• an infinite number

• a number multiplied by another number

5p + 4h - 2
Which are the variables? 

• 5p, 4h, 2
• 2
• p, h
• 5, 4

A comprehension test was given to students after they had studied textbook material either in silence or working together.
What is a possible control variable?

• Comprehension Test Results
• The thickness of the text book
• All students working in Silence
• Number of students working together and in Silence

Write the phrase as an expression.
twice a number x plus 8

• 2 + 8x
• 2x + 8
• 2(x+8)
• 8(2+x)

5x - 14 = 8x + 4

• x = 6
• x = -6
• x = -18/13
• x = 10/3

7x - 4 = 3 + 8x

• x = 7
• x = -7
• x = 2/7
• x = 11

14p - 8 = 22 + 20p

• -5
• 5
• 30

8x - 8 = -4x + 16

• x = 8

• x = 16

• x = 24

• x = 2

4x+2x+3x

• 10x

• 9x

• 11x

• 8x