Need someone’s help please???

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.

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

If 25% of y is 30, what is 60% of y?