Chemistry Help Please? Caloric content of food.?

Here is the question: A student performing an experiment to determine the caloric content of a cashew nut collected the following data:
- Mass of cashew nut burning: 0.55g
- After burning: 0.05g
-Temp. increase of 200g of water: 7.0 degrees Celsius

1. Calculate the total energy released by the combustion of the cashew nut by using the water temp. increase, the mass of the water and specific heat capacity of water.

2.Calculate the energy released per gram of cashew nut consumed in the reaction.

3. Using the following standards ( Carbohydrates (4 Cal/g), protein (4Cal/g), and fats 9 Cal/g), determine the caloric content of a bag of your favorite snack food. ( use pretzels)

thinks for your help