Two resistances are connected in series and parallel. The values of the resistances are:R 1 = 100.0 ± 0.3Ω, R 2 = 50 ± 0.2Ω. Calculate the equivalent resistance and its uncertainty in each of these...

Two resistances are connected in series and parallel. The values of the resistances are:R₁
= 100.0 ± 0.3Ω, R₂
= 50 ± 0.2Ω. Calculate the equivalent resistance and its uncertainty in each of these cases. A 9 V battery is connected across the two resistance arrangements. What are the currents and the uncertainties in each case.