What is the answer to 1 5/6 + 2 1/5

15 point ! ~ see if you know the answer to both you!

Which angle is the smallest? also give me an explanation so i can complete it to other questions as well, : )

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.