The question I chose is: Which of Dr. Cheng’s answers are you most interested in? Why? Do you agree with everything she says or do you think differently? How would you answer this question?

What interests me the most is this: “That’s what a formula does: it expresses a way to understand multiple situations simultaneously. That’s why we use letters instead of numbers. Letters can stand for *any* number, so you really can Write down something that applies to countless things, not just one thing.” If something similar or something similar happens, then there will be a unified approach to understanding it. For example, addition and subtraction are often used in our lives. We use addition and subtraction to figure out how much we spend when buying groceries or paying for a meal. I think that’s what formulas are for. That’s why I agree with her.