6) You decide to buy milk and orange juice. You buy \( 6 \) gallons of milk and \( 4 \) gallons of orange juice for \( \$ 30.50 . \) A gallon of milk cost \( 50 \) cents more than a gallon of orange juice. Find the cost of a gallon of milk and a gallon of orange juice.
\(6m+ 4o= 30.5\\m= 0.5+ o\\m= 3.25\\o= 2.75\)
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.)