Contextual and dictionary meaning of preservation

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

Mary is reading a book that has 135 pages. she can read 18 pages in an hour. if she takes h hours to finish reading the book, the equation that can be used to find the value of h is

What occurrence provides the climax for the story “the occurence at owl creek bridge? a.)when peyton farquhar is standing on the bridge waiting to be hanged b.)when peyton farquhar reaches his home and sees his wife c. when peyton farquhar feels the pain in his back and finally dies d.)when peyton farquhar is running home and feels his tongue swelling