Did the greeks use erasers in geometric construction?

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

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.

What ia the sum if the first 7 terms of the geometric series