Simplifying expressions

Simplify:6b + 7b - 10

• 3b
• 13b - 10
• 13b² - 10
• 3b²

Add these expressions
(x+5) + (2x+10)

• 3x+15
• x-5
• 18x

What is the simplified form of this expression
3x+4+5x+3

• 15x
• 8x+7
• 7x+8

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

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

w + w + w could be simplified as?

• 3w
• 3
• w
• 0

r +10r

• 11r

• -11r

• 9r

• -11

4a + 9 + a

• 5a + 9
• 14a
• 3a + 9
• 5a - 9

x²+2−1+6x²−4x²

• x ²  -1
• x² +1
• 3x² +1
• x ²+3

6w - 6w + 6w + 9w

• w
• 15w
• 9w
• 6w

4 is the __________ of 4n.

• equation
• variable
• coefficient
• solution