Question

Olivia and John decided to gather information about the amount of days of sunshine in their hometown.
Year 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Days of sunshine 150 162 174 186 198 210 222 234 246 258
Using the values in the table and the slope formula, calculate the average rate of change.

12 days
24 days
17 days
15 days

Answer 1

Average rate of change = (f(2019) − f(2010)) / (2019 − 2010) = (258 − 150) / 9 = 108 / 9 = 12 days per year.

Answer: 12 days.