The expression that should be equivalent is [tex]1/r^{42[/tex].
What is an expression?
An expression refers to a set of terms that should be combined by applying the operations +, – , etc.
Since the given expression is [tex]{r^{-7}}^6[/tex]
So if we solved it so it comes
[tex]r^{-42}\\\\= 1\div r^{42[/tex]
hence, The expression that should be equivalent is [tex]1/r^{42[/tex].
Learn more about an expression here: https://brainly.com/question/2750295
