Combining Like Terms

Which of these are like terms in the following expression:
3x + 7 - 9x + 24y + 2x²

• 7, 24y
• 3x, 9x
• 3x, -9x
• 3x, -9x, 2x²

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

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

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

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

-3(2x - 5)

• -6x - 15
• -6x + 15
• 6x + 15
• 6x - 15

Simplify the expression:
-7x +5 (1 - 8x)

• -33x + 5
• 5 + 33x
• 47x + 5
• 5 - 47x

Simplify the following expression:
-7x - 9x

• 63x
• 16x
• -16x
• -15x

Simplify the following expression:
5(1 - 8x)

• -33x + 5
• -5 + 40x
• 47x + 5
• 5 - 40x

2(10-5v) 

• -20+10v
• -20-10v
• 20+10v
• 20-10v 

Simplify the expression: 2x + 1 + 7x 

• 10x
• 10
• 9x + 1
• 9 + 1x

Select the term below that is a like term with xy. 

• 6x
• 7xy
• 3y
• 3x²y²