please answer #5 with the full work. if not the work please provide an explanation. I will make you the brainiest.

Name the most appropriate metric unit for each measurement

Find the distance between (7,-6) and (-3,-9)

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample