My brother needs and i'm to busy so i have my phone to him him you

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?

What term makes it inconsistent y=2x - 4

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.