Solve for x: ln x + ln (x-1) = 1

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse