An ‘a' train leaves a subway station every 12 minutes. an ‘e' train leaves every 9minutes. if both trains just left the station on parallel tracks, when will both leave the station together again? a. in 108 minutes b. in 36 minutes c. in 72 minutes d. in 24 minutes

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?

Three times the sum of a number and seven is negative thirty-six. what is the number?

In the geometric progression –3, 12, −48… what term is 3,072?