Final answer:
The question involves finding the distance a truck can travel per gallon of gasoline, utilizing the direct variation equation y = 18x, which falls under the Mathematics subject area for High School level.
Step-by-step explanation:
The student's question about the distance a truck travels on a certain amount of gasoline (y = 18x) falls into the subject of Mathematics, specifically into algebra related to direct variation. In this equation, x represents the number of gallons of gasoline, and y is the distance traveled in miles. The constant of proportionality is 18, meaning the truck travels 18 miles per gallon (mpg) of gasoline.
To find the number of gallons of gasoline necessary to fill an automobile gas tank, one would need to know the capacity of the gas tank. The number of cm in 2 m is a simple conversion, where 1 meter is equal to 100 centimeters, thus 2 meters is 200 centimeters. If one is interested in finding the time required to drive from San Francisco to Kansas City at an average speed of 53 mi/h, they would divide the total distance by the average speed.