Each of the intensive quantities formed in the applet “A Car & 20 questions” is of the form A/B where A and B are each measures of one of the following:[br][br] Distance in miles[br] Volume in gallons[br] Time in hours[br] Weight in pounds[br] Cost in dollars[br][br]The quantity A/B [for example, distance per weight in miles/lb, or time per volume in hrs/gal, etc.] can be thought of as a constant function of B [for example A/B = 30 mi/hr as a constant function of the time variable in hrs], [br][br]Alternatively, the quantity A can be thought of as a linear function of B [for example, A (miles) = 30 x B (hours)].[br][br]The left panel depicts A as a linear function of B. The right panel depicts A/B as a constant function of B.[br][br]Each of the 20 intensive quantities in “A Car & 20 Questions” can thus be represented graphically as a function in two ways. [br][br]Use the GOLD dot to adjust the number of A/B units[br]Use the BLUE dot to adjust the number of A units[br]Use the WHITE dot to adjust the number of B units