Astudy done from 1950 through 2000 estimated that the world population increased on average by 1.77% each
year. in 1950, the world population was 2,519 million.
a. write a formula for the world population t years after 1950. use pp to represent the world population.
b. write a formula for the number of years it takes to reach a population of p.
c. use your equation in part (b) to find when the model predicts that the world population is 10 billion.

(20 points) a bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. the bank prides itself on its mortgage application process and decides to investigate the claims. the bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days): 5, 7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 15, 10, 17, 12, 10, 9, 4, 10, 13 assume that the random variable x measures the number of days a customer waits for mortgage processing at this bank, and assume that x is normally distributed. 2a. find the sample mean of this data (x ě…). 2b. find the sample variance of x. find the variance of x ě…. for (c), (d), and (e), use the appropriate t-distribution 2c. find the 90% confidence interval for the population mean (îľ). 2d. test the hypothesis that îľ is equal to 7 at the 95% confidence level. (should you do a one-tailed or two-tailed test here? ) 2e. what is the approximate p-value of this hypothesis?

Ebert used to make $22 an hour, but got a 10% raise. how much more will he make in a 40 hour work week with raise?

If sina is 4/5 then find the value of sin3a . with explanation.