solve equation

What is the solution for x + 9 = 21

• 10
• 12
• 11
• 13

Solve for b
2b = -16

• 8
• 4
• -8
• 3

• x = 20
• x = 7
• x = 10
• x = 3

x - 8 = -5 

• 13
• -13
• 3
• -3

Solve:

• 96
• -96
• 4
• -4

Solve:

• -12
• -8
• 12
• 8

r + 20 = 27

• r = 7
• r = 47
• r = 13
• r = 20

What what is the inverse operation of subtraction?

• addition
• subtraction
• multiplication
• division

What is the inverse operation of division?

• Division
• Multiplication
• Addition
• Subtraction

x - (-2) = 7

• -9

• -5

• 5

• 9