Amazon. com uses a customer profiling system whenever a customer visits its website. using this system, amazon can offer products tailored to that particular customer's profile and buying pattern. what is amazon using to achieve this competitive advantage?

Write a program that asks the user to enter the name of an input file. if the file does not exist, the program should prompt the user to enter the file name again. if the user types quit in any uppercase/lowercase combinations, then the program should exit without any further output.

Using a conditional expression, write a statement that increments numusers if updatedirection is 1, otherwise decrements numusers. ex: if numusers is 8 and updatedirection is 1, numusers becomes 9; if updatedirection is 0, numusers becomes 7.

Why should you evaluate trends when thinking about a career path?