Question

how many seconds are there in 2500 years? (assume 1 year=365 days) express your answer using three significant figures

Answer 1

the question gives us a conversion factor but we need more:

1 year= 365 days
1 day= 24 hours
1 hour= 60 min
1 min= 60 seconds


`2500 years ( (365 days)/(1 year) ) ( (24 hours)/(1 day) ) ( (60 minutes)/(1 hour) ) ( (60 seconds)/(1 minute) )= 7.9x10^(10) seconds`

Answer 2

the answer is:
7.889 x 10^10 seconds