When they give you a x intercept and y intercept how do you write the equation

What is the logarithmic function modeled by the following table? x f(x) 9 2 27 3 81 4

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

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.