A motorboat takes 5 hours to travel 150 kilometers going upstream. The return trip takes hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

The equation respenting the left table is

If chord ab is congruent to chord cd, then what must be true about ef and eg?

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t. inv.2t to find the value of t for the interval calculation.