I’m on a timer PLZ HELP

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

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.