For each expression, give an equivalent expression that is a power of 6. That is your answer should have the form 6*, where * is an expression with numbers and possibly the variable k. (6^k)^k (6^2k)^3 (6^2^k)^2 6^2k-1/6^-k 6^2k/6 36.6^k 6^k^2. 6