Neeed help fast please

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Let r = 3. what is the value of r + 58?

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.