The regression line for a data set giving sales S, in dollars, t years after 2016 is  S = 210t + 2700. (a) Explain in practical terms the meaning of the slope. The slope of 210 dollars per year means that sales for the pertinent period are decreasing by $210 each year.The slope of 2700 dollars per year means that sales for the pertinent period are decreasing by $2700 each year.    The slope of 2700 dollars means the initial sales are 2700 dollars in 2016.The slope of 2700 dollars per year means that sales for the pertinent period are increasing by $2700 each year.The slope of 210 dollars per year means that sales for the pertinent period are increasing by $210 each year. (b) What sales are indicated for 2020?

Advanced Engineering Mathematics
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Chapter2: Second-order Linear Odes
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The regression line for a data set giving sales S, in dollars, t years after 2016 is 
S = 210t + 2700.
(a)
Explain in practical terms the meaning of the slope.
The slope of 210 dollars per year means that sales for the pertinent period are decreasing by $210 each year.The slope of 2700 dollars per year means that sales for the pertinent period are decreasing by $2700 each year.    The slope of 2700 dollars means the initial sales are 2700 dollars in 2016.The slope of 2700 dollars per year means that sales for the pertinent period are increasing by $2700 each year.The slope of 210 dollars per year means that sales for the pertinent period are increasing by $210 each year.
(b)
What sales are indicated for 2020?
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