Beginning Expressions

What is the algebraic expression for                  "the sum of n and 9"?

• n - 9
• n + 9
• n/9
• 9n

the product of 34 and z 

• 34/z
• z/34
• z X 34
• 34 - z 

take 10 away from s 

• 10 - s 
• s + 10
• s - 10
• s/10

half of a number, c

• c ÷ 2
• ½ ÷ c
• c ÷ ½ 
• c + ½

six times the number of girls
Let g = number of girls

• 6 + g
• 6g
• g - 6

What is a variable in Algebra?

• Something that changes
• An unknown value
• An equation
• A numeric expression

What is an algebraic expression made of?

• Numbers and operations
• Numbers and multiplication
• Addition and multiplication
• Numbers and variables

7 divided by c

• c/7
• 7/c

d + d + d + d =

• d⁴
• 4d
• d4
• 4 + d

Write the phrase as an expression.
12 fewer than 22

• 22/12
• 12 - 22
• 22 - 12