In 1980, median family income was about 19000 and in 2000 it was about 42000
a) find the slope of the line passing through the points (1980,19000) and (2000,42000)
b)Interpret the slope as a rate of change.
c) if this trend continues, estimate the median family income in 2007.

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no i am lost i have tried many problems like this and got them all wrong

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