Question 826024
Your equation should look more like this:
{{{h(t)=64 + 48t - 16t^2}}}
This is the equation of the height, above the ground, of am item that has been given an upward speed of 48 ft/s and begins its movement at a height of 64 ft above the ground.
The "y-intercept" is the value of y when the other variable equals zero.
When t = 0, h = 64.
i.e. the snowball is thrown from the building at t = 0, and at t = 0, h = 64 ft.
The graph of the equation looks like that below.

{{{graph(300,200,0,4,0,100,64 + 48*x-16*x^2)}}}