Instantaneous rate of change help!!?

Find and interpret the instantaneous rate of change when 50% remains?

D(x) = 1.66 - 0.90x + 0.47x^2

X is the fraction of remaining brine when x is greater than or equal to 0 or less than or equal to 1

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- November 18th 2012, 08:15 AMEmma22Instantaneous rate of change in a density function
**Instantaneous rate of change help!!?**

Find and interpret the instantaneous rate of change when 50% remains?

D(x) = 1.66 - 0.90x + 0.47x^2

X is the fraction of remaining brine when x is greater than or equal to 0 or less than or equal to 1 - November 18th 2012, 04:21 PMchiroRe: Instantaneous rate of change in a density function
Hey Emma22.

Try calculating the derivative at the point when 50% remains (Hint when 50% remains, then x = 0.5).