Middle school math please help will mark brainlist!!​

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Rewrite so the subject can be y in the formula d=m-y/y+n

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.