Help i-Ready math. No links and no guesses

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?

Ihave trouble finding the nth term of a linear sequence

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x