Expression or an Equation

Which of the following is an algebraic expression?

• 3 + 17 - k

• 3x - 45 = b

• 25 + 36

• 19 + 14 - 20

Which of the following is not a numerical expression?

• 13 + 7 - 25

• 39/13

• x - 2

• 47 - 5(10) + 23

What is the most important difference between an expression and an equation?

• they're spelled different

• an equal sign

• only equations have variables

• only expressions have variables

What does an algebraic equation have that a numerical equation doesn't have?

• variables

• equal sign

• terms

• fractions

Which of the following is not an equation?

• 2 + 2 = fish

• 2x + 4 = 25

• 3(4 + 5)

• 10 - 2x = 4

12 + 5 = 17 is  ______.

• an expression 
• an equation 
• neither an expression nor an equation

x-7 is  _______

• an expression
• an equation 
• neither an expression nor an equation.

3(n) means...

• the product of 3 and an unknown number
• the quotient of 3 and an unknown number
• the sum of 3 and an unknown number
• the difference between 3 and an unknown number

"Five more than three" is ...

• a variable.
• an equation.
• an expression.
• an inequality.

"n less than 3 is 10" is ...

• an inequality.
• a variable.
• an expression.
• an equation.