a) Equivalent Resistance= (1/25+1/55+1/75)^-1=14.0ohms(3s.f.) b) Current=9.0V/14.0=0.644A(3s.f.) c) Current through 25-resistor=9/25=0.360A Current through 55-resistor=9/55=0.164A Current through 75-resistor=9/75=0.120A All answers are rounded off to 3 significant figures