3. A paleontologist is plotting the ages of ancient bird-like creatures according to their wingspan. She finds that for every inch in wingspan increase, the creatures averaged an additional 6 months of age. What is the slope of the data's trend line if age is the independent variable and the data is plotted in terms of inches and years?

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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.