The time for a chemical reaction, Upper T (in minutes), is a function of the amount of catalyst present, a (in milliliters), so Upper T equals f left-parenthesis a right-parenthesis Number . (a) If f left-parenthesis 9right-parenthesis equals 20, what are the units of 9? What are the units of 20? What does this statement tell us about the reaction? The units of 9 are The units of 20 are f left-parenthesis 6right-parenthesis equals 20 tells us (b) If f prime left-parenthesis 6right-parenthesis equals negative 3, what are the units of 6? What are the units of negative 3? What does this statement tell us?