Given the function f left parenthesis x right parenthesis equals StartRoot x minus 7 EndRoot, complete parts a through c. (a) Find an equation for f Superscript negative 1 Baseline left parenthesis x right parenthesis. (b) Graph f and f Superscript negative 1 in the same rectangular coordinate system. (c) Use interval notation to give the domain and the range of f and f Superscript negative 1. (Hint: To solve for a variable involving an nth root, raise both sides of the equation to the nth power, left parenthesis RootIndex n StartRoot y EndRoot right parenthesis Superscript n Baseline equals y.)