Please Can anyone please help me with the problem here.

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.

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

What is the 12th term of b(n)=-4-2(n-1)