Final answer:
A cheeseburger from a fast food restaurant contains 363 kcal of energy.
Step-by-step explanation:
To determine the number of kilocalories (kcal) in the cheeseburger, we need to calculate the energy from each macronutrient and sum them up. Fat contains 9 Calories per gram, while protein and carbohydrates contain 4 Calories per gram. The cheeseburger contains 19g of fat x 9 Calories/g, which is 171 Calories from fat. It also contains 20g of carbs x 4 Calories/g, which is 80 Calories from carbs. Lastly, it contains 28g of protein x 4 Calories/g, which is 112 Calories from protein. Adding these values together, the cheeseburger contains a total of 363 kcal.