Which graph could represent a car that begins by increasing its speed, then travels at a constant speed, and then decreases its speed, as time increases? a graph with time (minutes) on the horizontal axis and speed (miles per minute) on the vertical axis. both axes are unnumbered. the speed begins at 0, goes up at first, is steady for a while, and then goes down over time. a graph with time (minutes) on the horizontal axis and speed (miles per minute) on the vertical axis. both axes are unnumbered. the speed begins in the middle of the vertical axis, goes down at first, is steady for a while, and then goes up over time. a graph with time (minutes) on the horizontal axis and speed (miles per minute) on the vertical axis. both axes are unnumbered. the speed begins at 0, goes up at first, goes down for a while, and then is steady over time. a graph with time (minutes) on the horizontal axis and speed (miles per minute) on the vertical axis. both axes are unnumbered. the speed begins in the middle of the vertical axis, goes down at first, goes up for a while, and then is steady over time. mark this and return