Which of the following numbers must be added to complete the square in the equation below? x2+9x+15=11

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Find the least common denominator for thesetvo rational expressions.n^2/n^2+4n+4 -3/n^2+7n+10