Use the partial products strategy to determine the value of the missing number. A multiplication equation arranged vertically with the number six thousand eight hundred seventy eight on top multiplied by five on the bottom. Below the equals line is the number forty, below is a question mark, below is the number four thousand, below is the number thirty thousand.

the answers are
350
35
34,390
34,040

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?