Which side lengths form a triangle? A. 4,7,9 B. 5,12,13 C. 20,22,24

Anyone know? is appreciated! will mark brainliest if correct!

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

You can find the constant of proportionality by finding the ratio of