HELP ME PLEASE WILL GIVE ANSWER ALL OF THEM

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10

Asap (i need to finish this quick) graph complete the sequence of transformations that produces △x'y'z' from △xyz. a clockwise rotation ° about the origin followed by a translation units to the right and 6 units down produces δx'y'z' from δxyz.