1. Which is an example of an algebraic expression?

A. 4(3 +8)

B. 18^2

C. 3 - a

D. 21 . 4

2. Which is an algebraic expression for 5 more than z?

A. 5z

B. z + 5

C. 5z + 5

D. 5 - z

3. Which word phrase can be used to represent the algebraic expression 4(21 + n)?

A. 4 plus the sum of 21 and a number n

B. 4 times the product of 21 and a number of n

C. 4 times the sum of 21 and a number n

D. 4 less than the sum of 21 and a number of n

4. Which is an algebraic expression for the word phrase "8 less than the product of 12 and a number x"?

A. 12x - 8

B. 8 - 12x

C. 12 - 8x

D. 8x - 12

5. Suppose you are building a brick border for a garden by stacking rows of bricks on top of each other. If the height of each brick is

2.5 inches and r represents the number of rows, which algebraic expression would represent the height of the brick wall?

A. 2.5 + r

B. 2.5r + r

C. 2.5

D. 2.5r