which of these four equations are equivalent? 1.x^3+27 2.(x+3)(x^2+3x+9) 3.(x-3)(x^2+3x+9) 4.(x+3)(x^2-3x+9). Is it A. l,ll B. l,lll C. l,lV D. lll, lV​

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?