A phone company charges for service according to the formula: C(n) = 27 + 0.03n, where n is the number of min talked, and C(n) is the monthly charge, in dollars. The rate of change in this equation is:

The initial value in this equation is: ​

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.