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

-12n - (-13n)

• -25n
• 25n
• n
• -n

Simplify the expression: 7+3(1 - 2x) 

• 21 - 6x
• 10 - 2x
• 10 - 20x
• 10 - 6x

Simplify    5(2 - 7n)

•  52 - 57n
• 10 - 7n
• 10 - 35n
• 10 + 35n

22 - [(5 + 2) + (16 - 4)]

• 5
• 11
• 3
• 12

34 -( 45 ÷ 9 ) x 5

• 9
• 12
• 3
• 16

[20 + (6 - 5)] + 4 x 3

• 33
• 23
• 13
• 8