Remainder part of Question:
Dena
Advertising Don't Advertise
Ron Advertising ($X, $400) ($300, $425)
Don't Advertise ($400, $100) ($350, $Y)
Answer:
Part A. Don't Advertise" is a dominant strategy only for Ron if the value of X is below $400.
Part B. "Don't advertise" is a dominant strategy only for Dena if the value of Y is below $100.
Explanation:
If Dena is desiring to opt to "Advertising", then Ron will only have more pay off in choosing "Don't advertise" if the X is below $400.
On the other hand, if Dena is desiring to opt "Don't Advertise", then Ron will only have more pay off in choosing "Don't advertise" if again X is below $400.
This means that the "Don't Advertise" is a dominant strategy only for Ron if the value of X is below $400.
Similarly, if Ron desires to opt "Advertising", then Dena will only have more pay off in choosing "Don't advertise" if the value of Y is below $100.
On the other hand, if Ron is desiring to opt "Don't Advertise", then Dena will only have more pay off in choosing "Don't advertise" if the value of Y is below $100.
This means that the "Don't advertise" is a dominant strategy only for Dena if the value of Y is below $100.