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May 30, 2016
Posted by **Lyanne** on Saturday, October 15, 2011 at 8:39pm.

a) Find the average rate of change of the function on the interval [2,4]

b)find the instantaneous rate of change of the function at x=3.

- calculus -
**Reiny**, Saturday, October 15, 2011 at 10:02pmwhen x=2 , y = 1

when x = 4, y = 27

average rate of change between those points

= (27-1)/(4-2) = 13

f'(x) = 3x^2 - 8x + 6

f'(3) = 27 - 24 + 6 = 9