Extracted text: The vertical angle to the top of the New CSU Library Building ("point B") is observed by a BSGE student at point A near the Harrison Bridge as 40.8884 degrees, with standard deviation of ± 5'. The slope distance from A to B is observed as 41.86 ± 0.15 m. Compute the horizontal distance and its standard deviation if a transit and tape was used in the observations.