Please help solve for n as well as the following questions that come once you find the right answer for n

You can model the population of a certain city between 1955-2000 by the radical function p(x)=55,000 sqrt x-1945. using this model, in which year was the population of that city 220,000

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?