nah 100 point yang bisa jwab kalau asal asal dilaporin

jawab :

1 kilo ohm = 1000 ohm

R1 / R2 = Rx / RS
1000 ohm / 10.000 ohm = Rx / 42 ohm
1/10 = Rx / 42
42 × 1 = 10 × Rx
42 / 10 = Rx
4,2 ohm = Rx

semoga membantu.....