suppose an x-y axis is superimposed on the map with its origin at Des Moines, Iowa. also suppose a cold front is passing through the US at noon having shaped roughly like a parabola with its vertex at Des Moines, Iowa ad a vertical stretch/ shrink factor of 1/20 if the independent variable is measured in hundreds of miles. What type of function are you working with. How do you know? Is the leading coefficient positive or negative?

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