Expression Adding

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Find the least common denominator of the expression

• 18

• 6x

• 3xy

• 6xy

Find the sum (−x + 8) + (−5x − 1).

• −6x + 7

• −4x + 7

• −6x − 8

• −6x + 8

Find the sum (−3x + 7) + (2x − 5).

• −x + 2

• −6x − 35

• −x - 2

• −5x + 2

The sum of seven and x

• 7-x

• x-7

• 7x

• 7+x

Identify the "like terms" in the expression: 
2x + 4y - 3x + y - x

• 2x and 4y and -3x

• 2x and -3x and x
  4y and y 

• they are all like terms

• there are no like terms

Combine like terms to simplify: a + 2a + 7

• 9a

• 3a + 7

• 2a + 7

• 9

Combine like terms to simplify: 3c + 2c + 6

• 5c + 6

• 11c

• c + 6

• 5c - 6

Combine like terms to simplify: 2d + 3 + d + 6

• 3d + 9

• 5d + 6d

• 3d + 6

• 2d + 9