I don’t know this question? Can you pls answer it...

Solve the system of equations. y= 2x y= x^2 - 15

How many days was the temperature above 90 degrees?

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