It depends on what information you have. Also, velocity can be negative - it just means that the object is travelling in the direction opposite to the positive direction for the velocity vector.
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The final velocity is (the initial velocity) plus (the acceleration multiplied by the time).
Use the formula Acceleration = (final velosity - initial velocity)/ time.
the formula for finding acceleration is final velocity, minus initial velocity, all over time. So if you have the acceleration and initial speed, which is equal to the initial velocity, you must also have time in order to find the final velocity. Once you have the time, you multiply it by the acceleration. That product gives you the difference of the final velocity and initial velocity, so then you just add the initial velocity to the product to find the final velocity.
Yes.
Without distance, you have to know time, initial velocity, and acceleration, in order to find final velocity.