7. Daisy wants to open a lemonade stand. The supplies for making the stand cost \( \$ 2.40 \) . One pitcher of lemonade costs \( \$ 2.85 \) to make and makes \( 10 \) servings.
a. Write an equation for the total cost in terms of the number of pitchers made.
b. Write an equation for the total cost in terms of the number of servings.
c. Write an equation for the average cost per serving.
a. Let y be the cost and x be the no.of pitchers, therefore the equation looks like
y = 2.85x
b. Let y be the cost and x be the no.of servings , therefore the equation looks like
y = 0.285x
c. Let y be the average cost and x be the no.of servings , therefore the equation looks like
y = 2.85/x
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.)
Use the quadratic formula or completing the square to determine the greater solution to
\( x ^ { 2 } + 4 x + 2 = 0 \) . Round your answer to the nearest hundredth. Record your answer and fill in the bubbles on your answer document.
