can please provide me a answer of my account class

3-5 How do management's product and service choices affect cost behavior? 3-6 Why are fixed costs also called capacity costs? 3-7 How do committed fixed costs differ from discretionary fixed costs? 3-8 Why are committed fixed costs the most difficult of the fixed costs to change? 3-9 What are the primary determinants of the level of committed costs? Discretionary costs? 3-10 "Planning is far more important than day- to-day control of discretionary costs." Do you agree? Explain