In a science experiment, the temperature of a substance is changed from 42 degrees to -54 degrees at an average rate of -12 degrees per hour. Over how many hours does the change take place?

Write as a product of two polynomials. 2(3–b)+5(b–3)^2

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?

If the average of x, y and z is 15 what is their sum