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Which of the following is an algebraic equation?

• 3 + 17 - k

• 3x - 45 = b

• 25 + 36

Which of the following is an algebraic expression?

• 3a - 1 = 5

• 39/13

• x - 2

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

• an equal sign

• only equations have variables

• only expressions have variables

What does an equation have that an equation doesn't have?

• variables

• equal sign

• terms

Which of the following is not an equation?

• 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 (multiplication) of 3 and an unknown number

• the quotient (division) of 3 and an unknown number

• the sum (addition) of 3 and an unknown number

• the difference (subtraction) between 3 and an unknown number

What are the coefficients in this statement?
a + 6b

• 6
• b

• 1, 6

How many terms in the following expression:
5x + 3y - 15 + x

• 2
• 3
• 4