the radius of sphere is 12.4cm assuming an uncertainty of one in the last figure calculate the percentage error in the radius also calculate the surface area and volume of the sphere using A = 4pie r^2 and V = 4/3pir^3 and calculate the percentage error in A and V

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Answer(b) 60 miles per hour;

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current