Diegos uncle sells computers. In addition to his wages, he gets paid 20% of the amount he sells

Describe all the numbers that when rounded to the nearest thousand are 645,000

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?

Is this a polynomial function? i need to know asap