Consider the exponential function f(x)=5x. Answer the following questions, giving suitable reasons wherever necessary:
a. (i) State the domain and the range of f.
b. (ii) Find the coordinates of the intercept made by the graph of f on the y-axis.
c. (iii) Identify any asymptote of the graph of f and justify your answer.
d. (iv) Explain whether f is increasing or decreasing on its domain.