Explain how to create an equation with infinity many solutions.

Solve the system of equations. y= 2x y= x^2 - 15

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.