like terms

What are the like terms in the following expression?

5a + 2b + 3a

• 5a, -3a

• 5a, 3a

• 5a, 2b

• 5a, 4

What are the like terms in the following expression? 
2x + 1 + 7x 

• 2x, 7x
• 2x, 1
• 2x, -7x
• 7x, 1

True or False:
4x and x are like terms.

• True 
• False

True or False:
y and 14 are like terms.

• True 
• False

True or False: Like Terms have to contain the SAME variable

• True

• False

Which of the following is a like term with  $5g$  

•  $8g$  

•  $5h$  

•  $5g^2$  

•  $5gh$  

2f + f

• 3f
• 2f
• f

5a + 2a + 2a 

• 9a
• 8a
• 7a

3b + b - 2b 

• 3b
• b
• 2b

6x + 2x + 1 + 4

• 8x + 5 
• 2x - 3
• 4x - 2
• 8x + 12