Salutes for the efforts and keep going on and things would be fruitful because the learning journey is a rewarding one...
Alas, from Google Search it looks like there are no published solutions to these challenges as of yet, this book's rated 1.9 from 8 in this link, you might also consider consulting the review section for a list of some books that you can have in the future, it is not really a negative thing that this book doesn't have answer, for at times the challenge is worth taking it after all...
I really wish you the best of luck and keep being around :).
Excellence is an Endeavor of Persistence.
Chance Favors a Prepared Mind.