Line k contains points A, B, C, and D. EA represents the difference between the y-coordinates and EC represents the difference between the x-coordinates of points A and C. Likewise, FB represents the difference between the y-coordinates and FD represents the difference between the x-coordinates of points B and D. Use similar triangles to explain why the slope of like k is the same whether the slope is calculated using points A and C or points B and D.

The slope best fit isc. 1/6 mile per hour

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.