tina knows that sonar measures distance by timing how long the echo of a sound takes to return. she says it is possible because sound has a particular frequency. is she correct

Ithink the answers is b i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you

How many calories in food

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

//(b) both involve the use of levers;