Whoever can solve this is a crazy

a ferry travels in a straight line from a to b

it then travels in a straight line from b to c

a speedboat travels in a straight line from a to c

how many more km does the ferry travel than the speedboat.

you must show you working.

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.