What is the solution to the following system of equations?
y = −x2 − 5x − 4
y = −x2 + 9x − 18
a. (-1, -10)
b. (1, -10)
c. (-1, 10)
d. (1, 10)

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?