Algebra: Concepts and Connections

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

• n - 9
• n + 9
• n/9
• 9n

What word phrase can you use to represent "5x + 2"?

• five times the sum of a number x and two
• two times the sum of a number x and five
• a number x times the sum of five and two
• the sum of five times a number x and two

Evaluate u + xy, for u = 18 , x = 10 , and y = 8.

• 188
• 36
• 98
• 224

Simplify.
5x + 7x

• 2x
• 12x
• -2x
• -12x

What is the range for {(1,2) (2,3) (3,4) (4,5)}?

• {1,2,3,4}
• {2,3,4,5}
• {1,2,3,4,5}
• {(1,2) (2,3) (3,4) (4,5)}

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

• 2 + 8x
• 2x + 8

Which of these are like terms in the following expression:
3x + 7 - 9x + 24y + 2x²

• 7, 24y
• 3x, 9x
• 3x, -9x
• 3x, -9x, 2x²

What is a variable in Algebra?

• A coefficient

• An unknown value represented by a letter

• An equation

• A constant

What is an algebraic expression made of?

• Numbers and operations

• Matrices

• Only variables

• Numbers, variables and operations(like add, subtract, etc..)

 Students mailed invitations to a play to 414 parents. Each student mailed 18 invitations. If s equals the number of
students who mailed invitations, which equation best shows the
number of invitations that were mailed?

•  s + 18 = 414 
• s ÷ 18 = 414 
• 18 ÷ s = 414
•  18s = 414