Answer:
hello! in short the answer is B! i took the test and didnt do very good but id thought id share this to help some people!
much love!~ chi chi
Answer:

Step-by-step explanation:
(r⁻⁷)⁶ = r⁽⁻⁷⁾ˣ⁶
= (r)⁻⁴²
Remember that X will always be one up or down depending on if there is a - or not (if it is just an x) and one over! Hope this helps