Which of the following characteristics of a parallelogram leads to the conclusion that every square can always be classified as a parallelogram? select all that apply.

four equal sides
bisecting diagonals
two pair of opposite parallel sides
two pair of opposite equal angles

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?