A circuit youre using discharges a 20 F capacitor through an unknown resistor. After charging the capacitor,

A circuit you’re using discharges a 20 μF capacitor through an unknown resistor. After charging the capacitor, you close a switch at t = 0 s and then monitor the resistor current with an ammeter. Your data are as follows:
Time (s)...................Current (μA)
0.5 ..............................890
1.0 ..............................640
1.5 .............................440
2.0 .............................270
2.5 .............................200
Use an appropriate graph of the data to determine

(a) The resistance

(b) The initial capacitor voltage.