51 inches.
This is because a stem-plot is formatted as so:
If it’s 5 on the left side of the line, anything on the right is the ones place making possible numbers 51, 53, 56, etc.
Hope this helps!
It might be resultant, I don't think it's net force because that's just the difference of the forces but it could be an unbalanced force
It should be D. 4 m/s
Hope this helps!