For 3) Use s = ut + 0.5at^2 with u = 0, t =5 ,s = 400 ft = 121.92 m to find a ( it appears to not be 9.81 in this case) then substitute t = 3 into s = 0.5at^2

5) f(x) is y translated +3 units in the x direction, expanded with scale factor 2 and reflected in the x axis.