Arain gutter is made from sheets of aluminum that are 18 inches wide by turning up the edges to form right angles. determine the depth of the gutter that
will maximize its cross-sectional area and allow the greatest amount of water to flow.
a. 5 inches
b. 4 inches
c. 4.5 inches
d. 5.5 inches

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.

Ithink b hope that