Answer:

Since there are 16 pastries in total, and 7 of them are chocolate, this will become your probability.
So, since the total is 16, this will be the denominator, and the 7 will be the numerator.
So, it will be 
y=0 because no matter what x value you have, y will always be 0
7.1 is already rounded to the nearest tenth, there would have to be a number after the 1 to be able to round it.