If y varies jointly as 'x' and 'z', and 'y = 20 when 'x = 15' and 'Z = 6' , find 'y' when 'x = 12' and 'z = 8.

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?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?