shutterfly sells 8x10 photo prints for $2.62 an 16x20 photo prints $12.95. Your friends says that this doesnt make any sense because the dimensions of the large print are only twice as big as the small print. How could you explain these pricing differences to your friend?

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.