Final answer:
Bella's average speed is calculated by dividing the total distance she traveled, 252 miles, by the total time taken, which is 4 hours, resulting in an average speed of 63 mph.
Step-by-step explanation:
To find Bella's average speed in miles per hour (mph), we use the formula for average speed, which is the total distance traveled divided by the total time taken. Bella traveled a total of 252 miles in 4 hours. So, her average speed is calculated by dividing the distance by the time.
The calculation for the average speed is as follows:
Average Speed = Total Distance / Total Time
Average Speed = 252 miles / 4 hours
Average Speed = 63 mph
Therefore, Bella's average speed for the trip was 63 mph.