38 Is it explain step by step
Answer:
Step-by-step explanation:
The ratio of a circumference to its diameter is equal to an irrational number, called pi, roughly equal to 3.14, denoted by symbol
Therefore, knowing the diameter d, the circumference is equal to d*π
It is (2) and (4) for your answer. I hope this has helped.
The average speed of Jen for the entire journey is 30 mph.
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Average speed</h3>
The average speed of a journey is the ratio of total distance to total time of motion.
Total time of motion = 3 + 9 = 12 hours
Total distance = 2[3(60)] = 2(180 miles) = 360 miles
Average speed = 360 /12
Average speed = 30 miles per hour
Thus, the average speed of Jen for the entire journey is 30 mph.
Learn more about average speed here: brainly.com/question/6504879