How many dinner specials are possible?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Question 5 of 10 2 points if a population is a sample of the population could be a. registered voters; all citizens o o b. baptists; all religious people o c. people who purchased shoes; all customers o d. the entire school faculty; math teachers

Math i have no idea how to do a and b