5.) At the end of 15 years an account earning 4.2% interest has $14,000. How much did the account start with?

Astudy of 80 english composition professors showed that they spent, on average, 14.6 minutes correcting a student's term paper. construct and interpret a 90% confidence interval of the mean time for all composition papers. assume that the population standard deviation is 2.9 minutes. round to 1 decimal.