Check your answers by referring to the Checkpoint 7A materials located at the back of your book.
Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 7A materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.
Answers and extra practice for the Checkpoint problems are located in the back of your printed textbook or in the Reference Tab of your eBook. If you have an eBook for Core Connections, Course 1, login and then click the following link: Checkpoint 7A: Simplifying Expressions