Pls help need this under 10 mins

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?

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)