An example of a function that models the number of barrels of crude oil and petroleum supplied per day is y = -0.025x^2 + 0.14x + 19.595. Remember that y is measured in millions of barrels per day.
The answer may vary.
Month (2008)
Products Supplied (millions of barrels/day)
January
19.71
March
19.79
October
18.495
Practice makes perfect
Let's begin by remembering the model that fits the data for the number of barrels of crude oil and petroleum supplied per day. Depending on the model you used, your answers may vary.
y = -0.025x^2 + 0.14x + 19.595
In the function above, y is measured in millions of barrels per day and x represents the month of the year 2008. Let's make a table where we associate the month of the year with its value of x.
Month
x-Value
January
1
March
3
October
10
To estimate the number of barrels supplied per day for the months January, March, and October, we must substitute x=1, x=3, and x=10, respectively.
