Write 200% as a decimal

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Which of the following is the shape of a cross section of the figure shown below

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.