SE-IDENTIFY LIKE TERMS

Which of these are like terms in the following expression:

3x + 9x + 2x²

• 7, 24y

• 3x, 9x

• 3x, -9x

• 3x, -9x, 2x²

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?

4x² + 3x + 2x

• -3x, -2x

• 3x, 2x

• -3x, 2x

• 3x, -2x

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

• 2x, 7x
• 2x, 1
• 2x, -7x
• 7x, 1

What are the like terms in the following expression?

5x + 8 + 2x

• 5x, -2x

• 5x, 2x

• 5x, 8

• 8, -2x

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

• True 
• False

True or False:
4 and 14 are like terms.

• True 
• False

True or False:
y and 14 are like terms.

• True 
• False

True or False:
u³and u² are like terms.

• True 
• False

True or False:
1 and -1 are like terms.

• True 
• False