Angles α and β are angles in standard position such that:
α terminates in Quadrant III and sinα = -5/13
β terminates in Quadrant II and tanβ = -8/15

Find cos(α - β).

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?