Write the quadratic equation whose roots are 1 and -1, and whose leading coefficient is 4

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.

How do you convert 1.27 to a percentage

Bring the fraction a/a-4 to a denominator of 16-a^2