A cargo service charges a flat fee of $5 plus $1.50 for each pound or fraction of a pound. Graph shipping cost, C(x), in dollars, as a function of weight, x, in pounds, for 0 < x ≤5.

A company produces very unusual CD's for which the variable cost is $12 per CD and the fixed costs are $40,000. Assume that they will sell all the CD's they can produce, and their selling price is $42 each. Let x be the number of CD's produced. Write the total cost C as a function of the number of CD's produced. C(x) = Write the total revenue R as a function of the number of CD's produced. R(x) = Write the total profit P as a function of the number of CD's produced. P(x) = Write the marginal profit as a function of the number of CD's produced. Marginal profit =

In 2011 online sales were $192 billion, and in 2015 they were $264 billion. (a) Find a linear function S that models these data, where S is the sales in billions of dollars and x is the year. Write S(x) in slope-intercept form. (b) Interpret the slope of the graph of S. (c) Determine when online sales were $246 billion. ..... (a) Write S(x) in slope-intercept form. S(x) = %3D (b) Interpret the slope of the graph of S. Choose the correct answer below. O A. Sales decreased by $18 billion in next 4 years. B. Sales decreased, on average, by $18 billion/yr. C. Sales increased, on average, by $18 billion/yr. D. Sales increased by $18 billion in next 4 years. (c) Online sales were $246 billion in the year