Final answer:
The correct inequality for the speed range on the freeway is 55≤speed≤75, while 80 km/h is equal to about 22.2 m/s and 49.7 mi/h when converted.
Step-by-step explanation:
The correct inequality representing the range of speeds allowed on the freeway, where the minimum speed is 55 miles per hour and the speed limit is 75 miles per hour, would be 55≤speed≤75. This means your speed should be greater than or equal to 55 mph but less than or equal to 75 mph.
Now, looking at unit conversions, to convert kilometers per hour (km/h) to meters per second (m/s), you multiply by ⅖ (approximately 0.277778). Therefore, 80 km/h converts to approximately 22.2 m/s. To convert from kilometers per hour to miles per hour, you multiply by approximately 0.6214. So, 80 km/h is approximately 49.7 mi/h.
Thus, the correct options from the given choices are (a) 55≤speed≤75 for the freeway speeds, and (b) 22.2 m/s, 49.7 mi/h for the speed conversion question.