Is △dbe similar to △abc ? if so, which postulate or theorem proves these two triangles are similar?
a. △dbe is similar to △abc by the sas similarity theorem
b. △dbe is similar to △abc by the ssa similarity theorem
c. △dbe is similar to △abc by the sss similarity theorem
d. △dbe is not similar to △abc

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?