Please guys It's my Trigonometry Test :
cos³A. cos3A+sin³A. sin3A =Cos³A ​

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.

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.

At school 460 of the students walk to school the number of students who take public transit is 20% of the number of students who walk. how many students take public transit