Mathematics Question

Grade: at least B

REQURIMENTS:

1. Please see the file first, make sure you can do all questions and can finish on time

2. I have about finished all the questions, I need your help to see where there are mistakes;

my steps are very brief, I need your help to add steps;

some questions are not completed, I need your help to complete

3. I will provide more notes after I confirm you

4. I will send you a message before I confirm you, please check it