Complete the following items. For multiple choice items, write the letter of the correct response on your paper. For all other items, show or explain your work.Consider the expression (r³m / r^⁻m t⁴ⁿ)¹/ⁿ . (r¹/ⁿ / t²/m )^⁻m .

a. Simplify the expression so that r and t are only written once. Show your work.