No, it would be unethical and a violation of Chegg's terms of service to use multiple accounts to upvote your own answers or manipulate your Chegg CF score. Chegg's Community Guidelines state that "any attempt to manipulate or fraudulently impact any activity on the Chegg platform, including but not limited to upvotes, downvotes, ratings, reviews, or question-asking, will not be tolerated." Chegg may take disciplinary action, including suspending or terminating your account, if it is found that you have violated their guidelines. It's important to maintain academic integrity and ethical conduct in all online activities