27 solid iron spheres, each of radius 'xcm'ate melted to form a sphere with radius 'ycm',find the ratio x:y​

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.

If a and b are real numbers, then |a-b| is always, sometimes or never equal to |b-a| ?

Write the solution to the given inequality in interval notation. a [4,6] b (4,6) c (4,6] d [4,6)