Byrcewilczak700 add me and what is 911 plus 711 plus 2020 plus -731

The trigonometric ratios sine and secant are reciprocals of each other

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.

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m