Which is most likey to contain brackish water?

Sara is creating an experiment. her hypothesis states the following. if i increase the air in my tires, then i will get better gas mileage. if this is her hypothesis what column titles do we need in our date table? a. air pressure in tire (psi) and gas mileage (mph) b. air pressure in the atmosphere (psi) and gas mileage (mph) c. miles (m) and gallons per mile (g) d. old battery and new battery

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f