Round 6.071981 to 3 significant figures

What is the simplified expression for 6(2(y+x))

Sam makes his sales calls according to a pattern. he travels either north or south depending on the calendar. some of his past trips were as follows: on february 17, april 24, june 10, september 19, and november 3 he drove north. on february 28, may 25, august 22, november 20, and december 18, he drove south. describe sams' pattern. in which direction will sam drive on oct4 and oct 24?

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