Given f(x) = x2 – 3 and g(x) = x+2 x. Find (g ° f)(4). please help

Determine the relationship of ab and cd given the following points

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.

Me. i can't figure out this question. give an explanation too. .