High school dropout rates. Table 2 gives U S. high school dropout rates as percentag...

High school dropout rates. Table 2 gives U S. high school dropout rates as percentages for selected years since 1980. A linear regression model for the data is

r = -0.164t + 13.9

where t represents years since 1980 and r is the dropout rate.

(A) Interpret the slope of the model.

(B) Draw a scatter plot of the data and the model in the same coordinate system.

(C) Use the model to predict the first year for which the dropout rate is less than 8%.