.Hey...I need help with Inverse Operations.

Complete each equation with the missing operation.

samples:

a + 4 ? 4 = a what is the inverse operation to addition?

z - 7 ? 7 = z what is the inverse operation to subtraction?

2b ? 2 = b what is the inverse operation to multiplication?

-15b ? (-15) = b what is the inverse operation to multiplication?