simplifying expression

In the expression below, the 3 is known as the _________________________

3y

• coefficient

• variable

• constant term

Which answer choice contains ALL like terms?

• -4x, 2x, 3x
• -4x, 2, 3y
• 4x², 2x
• 14, 4x

Simplify the Expression. 
9z  - 21 - 3z + 10

• Simplified
• 9z - 21 - 7
• 9z - 11 -3z
• 6z - 11

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

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

7(2x - 4) = 42

• x= 5
• x= 8
• x= 2
• x= 9

-3a + 8 = 14

• a= -2
• a= -7.5
• a= 2
• a= 6