Basic Physics

I have a rather simple problem.
Earlier today I asked for help concerning how to calculate the deceleration speed of an ascending object traveling at 150 km/h before it stops and weighing 360 kilos.
I got this:
Calculation: Velocity = 41.666667 Gravity = 9.81
        S = Vot+1/2at^
        S = 41.666667(4.2517) + 1/2(-9.8)(4.2517^2)
        S = 177.1541681+ -88.57706916
        S = 88.48671416 ≈ 88.5

My question is; what is (4.2517)? Where does it come from?

>>1
>My question is; what is (4.2517)? Where does it come from?

1) A number
2) Either the top row of keys or the number pad.