Answer :
Final answer:
The number 13 in Xin's equation corresponds to the initial amount of gas in the tank before she embarks on her trip.
Explanation:
The equation provided is g = 13 - 0.3h, for gas amount in gallons (g) over time in hours (h). The number 13 in this equation signifies the initial amount of gas in the tank. The reason being, this is the amount of gas Xin starts with before embarking on her trip, and as time proceeds, gas amount decreases at a rate of 0.3 gallons per hour. As such, the equation is demonstrating a linear relationship between the amount of gas left in the tank and the driving duration.
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