4: Submarines A submarine is destend ng to examine the seafloor \( 2,100 \) Ieet below the surface If takes the submarine \( 2 \) hours to make this descent. Write an equation to represent the relationshigi between the submarine selevation and time.
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.)