Question

The temperature of a liquid decreases steadily over several hours. If you calculate the average temperature change per hour, will your answer be positive or negative? Explain using the sign rules of multiplication or division.

Answer 1

It is 4 related to physics

Answer 2

 average change in temperature per hour = (final temperature minus initial temperature)/Time in hours 
As this is decrease numerator has to be negative and negative divided by positive is negative so average change will be negative.