Simplify the expression, cos(90° - θ)
i am not sure what to do

Factor the expression using gcf 9b+45

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?

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?