If the variance of a set of data is 9, what is the standard deviation? *

Ineed i been stuck on this question since yesterday

For what value of (y) is 3^3/3^y =1/9

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]