Please help will mark brainliest for the first answer (only number 13)

Write a polynomial that fits the description: a third-degree polynomial with leading coefficient -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.

The parabola opens: y=√x-4 (principal square root) up down right left