simplify expressions

Simplify the expression: 2x + 1 + 7x 

• 10x
• 10
• 9x + 1
• 9 + 1x

Terms that have the same variables such as 5x and -8x.

• like terms

• coefficients

• exponents

• variables

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

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

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

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

What is the variable? 8x + 15

• 8X

• x

• 15

• +

Simplify

5x + 3 - 2x

• 3x - 3

• 3x + 3

• 7x + 3

• 8x - 2

-6k + 7k=

• k
• -k
• 12k
• -12k

-2x + 11 + 6x

• 8x+11
• 4x +11
• 4x
• 15x

Simplify by combining like terms:
4x² - 3x + 11 -2x

• 4x² - 5x + 11
• 11x + 11
• 16x² - 5x + 11
• 10x²

2a + 9 + 4a

• 6a + 9
• 2a + 9
• 8a + 9
• 6a - 9