Ashoe store sells a foot cream that claims to relieve foot pain. which is the best source to use when evaluating this claims? a. someone who works at the store b. the website of the company that makes the foot cream c. a university study of foot pain d. a store that sells other foot creams answer is b right?

The answer should be C.
In the website, the purpose of it is to promote the product, therfore, they will claim all the benefits, no matter it is true or not.
However, in a university study, the purpose is not to promote. They will make sure the test fair and reliable. They have the best equipments and tools and the top investigators.
Therfore, a university study is the best source.

Rate law for this reaction israte of the reaction = k[a]²[b].second order in a  means concentration of a in power of two, and  first order in b means concentration of b in power of one.