Which ordered pair is a solution of the equation y=4x and why

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.

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?

597008.439431 to the nearest thousand