There is an average of 3.5×10^−2 kilograms of dissolved salt in each liter of seawater. the south china sea contains approximately 9.88×10^18 liters of seawater. how many kilograms of dissolved salt are in the south china sea? enter your answer, in scientific notation.

Your vet has placed your pet on a diet. the diet is to contain at least 12 mg of fat and at least 14 mg of protein per serving. these requirements are to be obtained from two food sources. source a contains 2 mg of fat and 2 mg of protein per serving. source b contains 1 mg of fat and 3 mg of protein per serving. if source a sells for $1.28 per serving and source b sells for $1.12 per serving, how many servings of each type should be purchased to satisfy the requirements at minimal cost?