Final answer:
The bridge with a height of 25.5 feet converts to 7.772 meters. An 18-wheeler tractor-trailer that just touches the bridge must be less than or approximately this height.
Step-by-step explanation:
The student's question pertains to converting the height of a bridge from feet to meters in order to determine if an 18-wheeler tractor-trailer can safely pass under without touching it. The bridge is marked with a height of 25.5 feet. To convert feet to meters, use the conversion factor where 1 foot is equal to 0.3048 meters. Therefore, the height of the bridge in meters is 25.5 feet * 0.3048 meters/foot = 7.772 meters. An 18-wheeler that just touches the bridge would need to be slightly less than or equal to this height to pass safely underneath without causing damage.