12 racks because 90 chairs divided into 8 racks, 11 racks is fully stacked with 8 chairs within it. while an addion rack will be added because 2 chairs is left. so the answer is 12 racks
<u>It is the first </u><em><u>graph</u></em><u>, whose description is: </u><em><u>The speed begins at 0, goes up at first, is steady for a while, and then goes down over time. </u></em>
Explanation:
Since the speed is on the vertical axis:
the first stage shows that the car begins with speed 0 and increases its speed,
then, the second stage shows that it travels a constant speed (constant speed is a steady line, i.e. paralell to the horizontal axis), and
the third stage shows the reduction (decrease) of the speed.
In general, lines with positive slope are increasing functions, lines with negative slope are decreasing functions, and horizontal lines (slope = 0) are constant functions.
