In a particular neighborhood association, 78% of the families have a credit card, 54% are paying off a car loan, and 41% have both a credit card and a car loan. What is the
probability that a randomly selected family in the neighborhood association has a credit card or
is paying off a car loan?

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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.