Acceleration is the derivative of velocity which is the derivative of position.
In other words
a = v' = x''
v = x'
where a : acceleration
v : velocity
x : displacement.
With this relation we can derive all the formulas you need.
Start with acceleration.
v = ∫a dt = a*t + C where t in this case is time and C is an arbitrary Constant.
By setting t = 0 we get C = V_0 where V_0 is initial velocity
Now we have the formula v = a*t + V_0
using the relationship v' = x we can derive a formula for position
x = ∫a*t + V_0 dt = (1/2)a*t^2 + v_0*t + C, setting t=0 we get x = X_0 where X_0 is initial velocity
Therefore we are left with the equations:
x = (1/2)a*t^2 + v_0*t + x_0
v = a*t + V_0
now you can plug in your values and get the answer!