3. A taxicompany monitoring the safety of its cabs kept track of the number of miles tires had been driven (in thousands) and the depth of the tread remaining (m mm). Their data are displayed m the scatterplot and the model summary is shown below. They found the equation of the least squares regression line to be (rounded to):

\fModel Summary: Statistic Value Correlation Coefficient r -0.874 Coefficient of Determination 76.4% Residual Standard Deviation 2.662