find the probability of drawing a diamond 8 through 10 on the first draw, replacing it, and drawing a black card on the second draw?

I'm confused on this could anyone me and show me what i need to do to solve it.

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 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?