What is the y-intercept of the line connecting (–6,3) and (0,0)?

option 4. b = -6

Answer question above and explain each step : )

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?

Ill mark the brainliest if you me with the these three questions 7,8,9