Textbook solution

I have a homework that will be graded as midterm. 

I need to solve the questions that are end of chapters step by step because the  midterm is same    

The book is Signals and Linear Systems, 3rd Edition

Robert A. Gabel, Richard A. Roberts

currently, I just want to answer some questions not all from ch1&3 

Robert A. Gabel, Richard A. Roberts

Please , if you dont know about the book dont try to solve it because this soiuation will be graded and I dont want to loss full mark