The minimum is the lowest y value of a given function and the maximum is the highest y value. In this instance, the vertex is the minimum. This means the minimum value is -1. There is no maximum as the function seemingly increases forever.
My brain is weird on how i figure it out but I divided 48 by 60 and got .80 so i just got the other whole to make it 1 so it is 20%. This is not the correct way to do this but this is how i got my answer.