Aboard is 6 1/2 feet long. you cut off a 1 3/4-foot piece and a 2 2/3-foot piece. how much of the original board is left?

And explain how you got it so i can understand future problems : 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.

What makes a trapezoid an isosceles trapezoid?