20. The following data represents measurements of the concentration of a substance in a patient's bloodstream, after the start of treatment meant to boost the concentration. Days after start of treatment Concentration in ppm 2 5.4 5 6 10 7 a) Draw the graph of the function. b) Identify the independent and dependent variable. c) What are the domain and range of this function? d) Use words to describe the function. e) Find the concentration on day 6 (using your graph). f) Find the day on which the concentration is 6.6 ppm (using your graph). g) Write a linear function that will describe this situation. Check your answers e) and f).

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