What are 4 equivalent expressions for 42 18?

The expression "42 18" likely refers to the numbers 42 and 18 being combined in some way. Four equivalent expressions could be:

1. 42 + 18
2. 60 (the sum)
3. 42 - (-18) (adding the negative)
4. 18 + 42

Each of these represents the same relationship or value derived from combining the numbers 42 and 18.