Need help converting to amps and finding the resistance.I need help with an explanation of the last 2 questions

Results: Trial Potential Difference Current, I Resistance R=V/I 4 (V) in volt in amps in ohm 1.5 3.0mA= 3.0x 101-3 A 1.5/3.0x 101-3 A- 500ohm N 3.0 6.0mA 4.5 9.0mA A 6.0 12.0mA UI 7.5 15.0mA Question-1: What is the mathematical equation to measure resistance by following Ohm's law. Question-2: How did you verify Ohm's law through this lab? Explain your answer in brief (investigate your data from Trial-1 to Trial -5 and then discuss the relationship in between electric potential and current)