The rate of U.S. per capita sales of bottled water for the period 1993-2003 could be approximated by Q(t) = 0.05r + 0.41 + 9 where t is the time in years since 1990. Compute the average annual sales of bottled water over the period 1996-2003, to the nearest gallon per year. O a. 15 gallons per year b. 17 gallons per year O c. 16 gallons per year O d. 18 gallons per year O e. 19 gallons per year

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Rate of Change

The relation between two quantities which displays how much greater one quantity is than another is called ratio.

Slope

The change in the vertical distances is known as the rise and the change in the horizontal distances is known as the run. So, the rise divided by run is nothing but a slope value. It is calculated with simple algebraic equations as: