I'm taking a college course in nutrition and my assignment is about analyzing a food label. There are questions like total fat/carbs/protein (grams) per serving and total energy (calories) from fat/carbs/protein per serving and percent of energy from each of those. I'm supposed to show math but I am unfamiliar with the equations that are used as I have yet to purchase the book due to financial issues. It would be greatly appreciated if anyone can help. thanks.