Need a hint: ) lim x-> a: (ln x - ln a) / (x - a)

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

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