Sketch the graph of 4 x squared + 25 x minus 21 using your graphing calculator. What are the x-intercepts of this graph? a. Negative three-fourths, 7 b. Three-fourths, negative 7 c. Negative three-fourths, negative 7 d. Three-fourths, 7 Please select the best answer from the choices provided A B C D

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?