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Find slope and interpret slope (rate of change)

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In 1990, the minimum wage was about $3.50 per hour, and in 2005 it was 5.15.

a) Find the slope of the line passing through the points (1990, 3.5) and (2005, 5.15).

b) Interpret the slope as a rate of change.

c) If this trend continues, estimate the minimum wage in 2015.

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