Some important things about johnny tremain

i have he is a 14 year old boy and i also have already explained his apearnce give some more : )
chapter 1 through 12

One of the author's purposes in the code book is to explain different types of codebreaking to his readers. which line best demonstrates this purpose? a theoretical breakthrough would be a fundamentally new way of finding alice's private key mathematicians have been studying factoring for centuries, and modern factoring techniques are not significantly better than ancient techniques a more recent development is the so-called tempest attack, which aims to detect the electromagnetic signals emitted in a computer's display unit if scientists could build a quantum computer, it would be able to perform calculations with enormous speed mark this and return save and exit next submit

Those are books that need to be returned to the library what is the antecedent of the pronoun those

Make a story with words handle trouble simple people middle table little gentle poodle pickle