Describe how acceleration and velocity are related and specify if these are scalar and vector quantities

Velocity is the rate of change in distance over change in time, this can be written as:

v = Δd / Δt

While acceleration is the rate of change in velocity over change in time, this is written as:

a = Δv / Δt

Both quantities are vector quantities because negative values means that the acceleration or velocity is acting on the opposite direction.