explain the difference between the function characteristics between "f(n) = Big-Oh of g(n)" and "f(n) = Big-Theta of h(n)"

Plz hurry evaluate the expression a+b where a=8 and b=19

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

If my mom gets $13.05 an hour, and she works from 3: 30 to 10: 45 in the morning, how much money does my mom make?