Simplify the expression: 2x + 1 + 7x 

• 10x
• 10
• 9x + 1
• 9 + 1x

Simplify the expression: 7v + 2 + 12 + 2v

• 23
• 23v
• 9 + 14v
• 9v + 14

Combine like terms
3x + 2x + 3y - 7y

• 5x + 10y
• 5x + 4y
• 5x - 4y
• 5x -10y

Collect like terms: 
4y + 8d - 2y + 3d

• 11d + 6y
• 11d + 2y
• 6y + 5d

5a + 2a + 2a 

• 9a
• 8a
• 7a

Simplify the expression: 
3t + 7y + t + 3y

• 3t + 10y
• 4t + 10y
• 4t + 4y

Collect like terms:

4y + 8d - 2y - 3d

• 11d + 6y

• 11d + 2y

• 6y + 5d

• 2y + 5d

Simplify the following expression:
3 + 5x + 8 - 2x

• -3x² - 11
• 3x² + 11
• 11 - 3x
• 11 + 3x

Simplify:

x²+2x+3x

• 6x

• 6x²

• x²+5x

• 7x

Collect like terms:

x²+y²+x+2y-3y²

• 2x²

• x²+y²+x-y

• x²-2y²+x+2y

• 3x+y