Answer:
Step-by-step explanation:
The question here is "how many pages does this book have?"
In 4 hrs, at 55 pages/hr, he reads 220 pages.
Adding the number of pages read (220) to the number of pages left to read (350) yields a total of 570 pages in this book.
Next time, please try to be more specific about what you want to find. "functions formula" is very ambiguous and unhelpful.