What's the three steps to finf the least common denominator when dealing with rational expressions HELP

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.

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

If m 17 27 90 63 ** picture is attached