If f(theta) = sin( theta ), find the exact value of the function for f(5theta) if theta = pi/4. only question I missed on my last test that I can’t figure out. I’d appreciate some help!

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.

Urgent? will give brainliest to the first correct answer what is the area of the figure?