HELP 25 MARKS!! PLEASE HELP

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

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

How to simply and write the answer n a whole number