Simplify f(x)=x^2-4x-7 in vertex form

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 absolute value of the complex number -4-sqrt2i

Graph the equationy= x+3[tex]y = x + 3[/tex]