Solve by a method of your choice. A medical researcher needs 9 people to test the effectiveness of an experimental drug. If 12 people have volunteered for the test, in how many ways can 9
people be selected?
The 9 people can be selected in ways.

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?