What is the radius of the circle with the equation

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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.

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)