Solve this and show work. Will mark brainliest

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

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

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)