Can someone pls help me with this?

What is the value of r of the geometric series?

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

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.