Loni needs between 3.5 and 7.2 volts of energy, not inclusive, to make an experiment work correctly. Write a compound inequality to show the voltage amount that is within the necessary range. Graph the solutions.
1. x < 3.5 or x > 7.2
2. x ≤ 3.5 or x ≥ 7.2
3. 3.5 ≤ x ≤ 7.2
4. 3.5 < x < 7.2