Here are the answers to your questions:
Question 2: How long is a patent valid for?
Answer: 20 years
Question 3: You will need a patent to protect your artistic designs, music, and writings.
Answer: False (These are typically protected by copyright.)
Question 4: Most copyrights are valid for...
Answer: the creator's lifetime, plus 70 years
Question 5: Symbols used to identify goods and services are called copyrights.
Answer: False (They are called trademarks.)
Question 6: The unauthorized use of intellectual property is referred to as
Answer: infringement
Question 7: The purpose of a trademark is to
Answer: All of the above (deter misleading advertising, avoid confusion, add protection, identifies goods and/or services)
Question 8: A trademark can be registered and last for how long?
Answer: Forever (as long as it is in use and renewal fees are paid)
Question 9: The use of a copyright symbol and date is required.
Answer: False (It is not required, but it is recommended for protection.)
Question 10: Patent applications can be denied if the invention is not useful.
Answer: True
If you have any more questions or need further assistance, feel free to ask!