How can I find speed from Initial Velocity and Acceleration

I don't know how I would go about solving them. The question I was initially given has the initial velocity as +12 m/s, and the Acceleration as +3.1

You just multiply the acceleration by the time its been accelerating and add initial velocity.
in Physics we use the equation Vf=Vi+a*t

You didnt give a time but for 1 second
Vf=Vi+a*t
Vf=12m/s+3.1m/s^2*1s
Vf=12m/s+3.1m/s
Vf=15.1m/s

2 seconds= 18.2m/s
3 seconds= 21.3m/s
5 second= 27.5m/s
10 seconds= 43m/s
1 minute= 198m/s
1 hour= 11,172m/s

To solve this you would also need time because you need to know how long the object has been accelerating for. After that just solve the new speed using the equation of a = (v2-v1)/t, where a is acceleration in m/s^2, v2 is final velocity in m/s, v1 is initial velocity in m/s, and t is time in seconds.