caden8233

03.11.2020 • 

Mathematics

The scatter plot drawn at left depicts the price of 1 gallon of gasoline in the United States (U.S.), y, in dollars, from 1980 to 2008. If x
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?
A
In the year 1997, the price for 1 gallon of gasoline
reached its exact maximum value of $1.33.
B
In the year 1997, the price for 1 gallon of gasoline
reached its exact minimum value of $1.33.
In approximately the year 1997, the price for 1
gallon of gasoline reached its approximate
maximum value of $1.33.
D
In approximately the year 1997, the price for 1
gallon of gasoline reached its approximate
minimum value of $1.33.

Ответ:

ciarrap552

16.06.2021

Mathematics

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40 mph would be 120 miles in 3 hours (120/40)

80 mph is 120 miles in 1.5 hours(120/80)

3 - 1.5 = 1.5, not 3 hrs

Change the speed to 20 mph( 1/2 the speed) to double the hours.

20 mph = 6 hours(120/20)

40 mph = 3 hrs(120/40)

6 - 3 = 3 hours difference

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