They must be familiar with mixture problems. Architects design buildings for structural integrity and beauty. They must know how to calculate loads for finding acceptable materials in design. Biologists study nature to act in concert with it since we are so closely tied to nature. They must have strong logic skills.
Geologists use mathematical models to find oil and study earthquakes.
Lawyers argue cases using complicated lines of reasoning. That skill is nurtured by high level math courses. The also spend a lot of time researching cases. Managers maintain schedules, regulate worker performance, and analyze productivity. Medical Doctors must understand the dynamic systems of the human body.