Which expression correctly represents "eight times the difference of four and a number"? O Bn-(4)
O 8(4-7)
o Bện)-4
O 8(4)-

HELP ASAP

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 is negative 3/9 times negative 2/8 ?

What is the value of x? enter your answer in the box.