The average high temperature each month in a calendar year

Last updated: 7/9/2022

The average high temperature each month in a calendar year for a city in South Carolina is represented by the function f(x) = -x² + 13.3.x + 42, where x is the month. Find the average rate of change from September to December. A) -1.7°/month bicycle helmets B) -11.6°/month swim goggles C) -7.7°/month tutus D) 5.8°/month ski masks E) 6.40/month tuxedos