I really really need your help with my homework. Please can you help me to solve this question? Thanks​

What expression is equivalent to 1/2(2+3x-6)

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

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?