Price of Gasoline in U. S. (1980 – 2008) y
3.25
The scatter plot drawn at left depicts the price of l gallon of gasoline
in the United States (U. S.). y. in dollars, from 1980 to 2008. If
represents the number of years since 1980, the graph of a quadratic
model that fits this data has a vertex at (17.24, 1.33). What does the
vertex tell us about U. S. gas prices?
3-
.
2.75
5 2.5-
5 2.25
In the year 1997, the price for 1 gallon of gasoline
reached its exact maximum value of $1.33.
Price of 1 gallon of gasoline (in U. S. dollars)
2-
3 1.75
5 1.5-
S 1.25
In the year 1997, the price for 1 gallon of gasoline
reached its exact minimum value of $1.33.
1
0.75
0.5-
In approximately the year 1997, the price for 1
gallon of gasoline reached its approximate
maximum value of $1.33.
0.25
20
5
25
30
10 15 20
Years Since 1980
In approximately the year 1997, the price for 1
gallon of gasoline reached its approximate
minimum value of $1.33.