Answer:
Total change in time is -40 seconds. It is represents by the integer -40 because negative sign represents the decrease in time.
Explanation:
It is given that each year for 5 years the time it takes you to run a mile decreases by 8 seconds.
Total number of year = 5
Change in each year = -8
Here negative sign represents the decrease in time.
Total change in time = Total number of year × Change in each year
Therefore, total change in time is -40 seconds. It means, we need 40 seconds less to run a mile.