Solve the system of equations.
-4x+y=9
7x+ y = 42

With this one. will mark brainliest

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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.