combining like terms

Simplify by combining like terms:
5a + 2b - 3a + 4

• 8a + 2b + 4
• 2a + 2b + 4
• 8ab
• 4ab + 4

3x-5x

• 2x
• 8x
• -2x
• 15x²

Simplify the expression: 3x + 2x

• 5x
• x
• 6x
• 5

-6k + 7k=

• k
• -k
• 12k
• -12k

Simplify the expression: 2x + 1 + 7x 

• 10x
• 10
• 9x + 1
• 9 + 1x

n -10 +9n -3=

• -3
• 9n-3
• n
• 10n -13

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

3n+5p+2+n

• 10np
• 8np+2+n
• 4n+5p+2

2x+8x+4x

• 10x+4
• 14x