By What Percent Will The Product Of Two Numbers Change If One Of Them Increased By 20% And The Other Decreased By 20% It will become *?*% Smaller or Bigger

With alll of except for the 2 that i did already

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

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4