i forgot the formula for rate of change

What is the rate of change of texas spending from 2011 and 2015
in 2011 it was 221,155.9 and 2015 it was 252,655.5

2 answers

rate of change of what?
rate of change of spending per year??

from 2011 to 2015
= change in spending/change in time
= (252655.5 - 221155.9)/(2015-2011)
= ....
oh I forgot to include that yes, rate of change of spending per year. Thank you