Guess this people . Hint is my fav game

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

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%