I need a strategy and explain how it gets solved ?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

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