Newton's first law of motion states that an object remains at rest unless a(n) force acts on it.
a. balanced c. gravitational b. frictional d. unbalanced

Unbalanced glad i could help :)

I believe your answer is D. Because if you think about it if you have... lets say a ball... so a ball is on a flat table right? and its not moving right? then what happens when you blow on it or push it or hit it with something then it moves right? so it would be considered an Unbalanced force makes an object move due ti the fact that the unbalanced object forces itself upon the object you're trying to move. make sense?

We can’t you if you only tell us that you have to show us what the answers are

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na