For 1 and 2 you may find the old answers if you search it
Y=125,000 (1+.035)^10
Y=125,000 (1.035)^10
Y=125,000 (1.410598716) or 125,000 (1.41)
Y= $176324.85 or $176250
If you are trying to see how much the population is in 1800, it is 9.24 million. You add the population from 1790 and the amount it has grown for 1800.