Fill - in - the - blank. Write each statement, filling in the blank with the appropriate word that best completes each statement. 17. Exponential and logarithmic functions are functions. 18. The domain of f (x) = a" for a > 0 is the set of 19. A base 10 logarithm is a(n) logarithm. 20. A base e logarithm is a(n) logarithm. 21. The y - axis is a(n) for the graph of f (x) = log.(x). 22. The of the function f(x) = loga (x) is (0, 00). 23. The logarithm of a product of two or more numbers is equal to the of their logarithms, while the logarithm of a is equal to the difference of their logarithms