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 a 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?

The U.S. gas price is 24 vortexes to high

Step-by-step explanation:

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."