What numbers add to negative 1 and multiply to negative 30

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 name used to describe a graph where for some value of x, there exists 2 or more different values of y?

What is the volume of a cone with a height of 6 cm in the radius of 2 cm