Using the defects method, which of these relationships represents the law of cosines if the measure of the included angle between the sides a and b of ∆abc is more than 90°?

a. area of square c2 = -area of square a2 – area of square b2 + area of defect1 + area of defect2

b. area of square c2 = area of square a2 + area of square b2 + area of defect1 – area of defect2

c. area of square c2 = area of square a2 + area of square b2 – area of defect1 – area of defect2

d. area of square c

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?