P(n)=news time/total time
We are told that the news is 14 minutes long during an hour so
p(n)=14/60
p(n)=7/30
I divided 315 by any random number and chose the one that gave me a whole number
So I got

x
The answer is F because you would have to multiply both 4 and 3 to get 12. Then you add both of the exponents for X to get 5. You wouldn't have to do anything for Y because you can't add it to anything.
I am not really that great with that but try googling it, it should pop up somehwere, sorry in advance.