+129852 Shane....it affects all three
Look at the graphs of -2t^2 + 6t + 2 and -2t^2 + 6t + 4 here : https://www.desmos.com/calculator/wwptrmff6z
The second graph has a greater starting and max height.....the change in the constant c also shifts the t intercept to the right, in this case
So K is correct
