Can you please help me out no where else has the correct answer.

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

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.