Question

each year, the campers at rebas summer camp try to set that summer’s record for finishing the obstacle course as quickly as possible. record obstacle course completion times year record time (minutes) 2011 29 2012 24 2013 28 2014 22 2015 22 according to the table, when was the rate of decrease greater? between 2011 and 2013 between 2014 and 2015

Explanation:

Step1: Calculate 2011-2013 decrease rate

Rate = $\frac{29 - 28}{2013 - 2011} = \frac{1}{2} = 0.5$ min/year

Step2: Calculate 2014-2015 decrease rate

Rate = $\frac{22 - 22}{2015 - 2014} = 0$ min/year

Step3: Compare the two rates

0.5 > 0, so 2011-2013 rate is greater

Answer:

between 2011 and 2013