Book and card
My name is Thi Tran. I bought your product. Now I need some information.
I have a book, I have a card, but my classcourse doesn't use this card. I have a book question as picture. I don't have any course class. I want to check the expalnation example in the book. How can I do?
Would you like to instruct me how to check solution for my problem? I appreciate your response.
questions of "try it"