calculus

Union membership as a percentage of the labor force can be modeled by
M(x) = 0.0003x3 − 0.066x2 + 4.64x − 81, where x is the number of years after 1900,and M is membership as a percentage of the labor force.
a. Find the rate at which membership is changing in 1960.
b. Find the rate at which membership is changing in 1985.

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asked by lis
  1. M'(x) = .0009x^2 - .132x + 4.64

    Now just evaluate M' for your years.

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    posted by Steve
  2. ty!

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    posted by lis

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