3,1,1/3,1/9, is this arithmetic or geometric

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

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.]

Asap! i need this done today and i really don’t understand it. some one ! will mark