Answer:

Explanation:
Let d represents the number of dogs that will attend the event.
She wants to have 2 biscuits per dog plus an additional 35 dog biscuits.
So, the expression that represents the number of dog biscuits Nicole will need for the event is :

2d because 2 biscuits for each dog where 'd' is the number of dogs. And 35 is constant because she will be taking extra 35 with her.