I will attach the book for you to use in order to answer them but please answer each one in a separate sheet of paper with clear hand writing please !

2.13,

2.14,

2.20,

2.21,

2.26,

2.28,

2.30

The book: Fundamentals of Logic Design 7th edition or click the link below

http://ceit.aut.ac.ir/~arabzadeh/Parand/Logic/Books/Roth%20Fundamentals%20of%20Logic%20Design%207th%20c2014%20txtbk.pdf