Please help! will give the brainiest to correct answer, and this is worth a ton of points!

If square root x = -7, then x= -49 true or false

Which of the following is the graph of y= square root -x-3

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