In a survey, 10% of the people said they live in a city. if 60 people said they live in a city, how many people were surveyed? show all work

What expression is equivalent to 42x-56y

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

Which is the value of this expression when p=3 and q=-9