An easy way to do these questions is to treat the >/</<u>></u>/<u><</u> symbols as if they were an equals sign.
So for this question, pretend it is d+13=22 then take away 13 from both sides which will give you d=9, then after that you'll just switch the symbol back and write your answer as d <u>></u> 9.
The answer is B. 10 vertices because it all depends on the edges. You have to subtract the edges by faces/vertices to get your faces/vertices so 20-12 is 10 so you are correct
