What is the least common multiple and greatest common factor of 24 and 21

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x

(60 points) explain this in detail