A baseball is projected upward from the top of a 448-ft-tall building with an initial velocity of 48 feet per second. The hieght, h, of the baseball above the ground at any time, t, in

seconds, is given by the equation h(t) = –16t2 + 48t + 448.

a) Find the height after 2 seconds

b) Find the height after 4 seconds

c) Find the time it takes for the baseball to strike the ground.

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.