A giant tortoise can travel \( 0.17 \) miles in \( 1 \) hour. At this rate, how long would it take the tortoise to travel \( 2 \) miles? It would take the tortoise \( \square \) hours. (Type an integer or decimal rounded to one decimal place as needed.)
A linear function that models data is described below. Find the slope of the model. Then describe what this means in terms of the rate of change of the dependent variable per unit change in the independent variable. The linear function \( f ( x ) = - 0.41 x + 28.6 \) models the percentage of adults in a country who smoked cigarettes, \( f ( x ) \) , \( x \) years after \( 1997 \) .
The slope is \( \square \) . (Type an integer or a decimal.)