In Exercises 1–12, use the tools in the section to answer the questions presented.
Consider a chemical reaction where molecules of type A combine with molecules of type B to form molecules of type C. Suppose one molecule of type A combines with one molecule of type B to form one molecule of type C, and that type C is produced at a rate proportional the product of the remaining number of molecules of types A and B. Let x denote moles of molecules of type C. Find a function giving the number of moles of type C at time t if there are originally a moles of type A, b moles of type B, and zero moles of type C.