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Since the creation of a social program, the percent of persons 65 years and over with a family income below the poverty level has declined. The percent can be approximated by the function P(t)=30.71-5.77ln t, where t is the number of years since 1965.
Find the percent of persons 65 & over with family income below the poverty level and the rate of change in 1970.
i know how to find the percent, but don't know how to find the rate of change. Please help!
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