The rate of change is the derivative,
f'(x) = 3x^2 + 3.
Between x = 1 and 2, it increases from 6 to 15
f(x)=x^3+3x find the rate of change between the two stated values x:1 to 2
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http://www.answers.com/collage
http://www.shapecollage.com/
Interesting!