1. The problem asks to find answers for parts b to f, but since only the first question or problem is to be solved, I will solve part b completely. 2. Without the original problem statement, I will assume part b involves solving or simplifying an algebraic expression or equation. 3. Please provide the exact problem statement for part b to proceed with a detailed solution. Since no specific problem details were given, I cannot solve part b. Please provide the problem statement for part b.