Ai giúp em với ạ bài này em làm không đc huhu

Which of the following is equal to the rational expression when x is not equal to -2 or -6?

Renee hiked for 6 3/4 miles. after resting, renee hiked back along the same route for 5 1/4 miles. how many more miles does renee need to hike to return to the place where she started? represent your answer as a simplified mixed number, if necessary.

Brainliest find the value of a^n b^n if n=3,a=100,and b=1/4