I got (c) for the first one, (a) for the second one, and (b) for the third one. How do the tables correspond to the graphs?

(a)
The answers: Graph 2 and Table Z
The slope of the graph shows rate of the increase in population.
In Graph 2, the slope is increasing. This shows that the population of fish rose slowly at first, and then rose more and more rapidly.
In table Z, the increase of number of fish was 1000 in the first year, 2000 in the second year, and 6000 in the third year.

(b)
The answers: Graph 3 and Table X
In Graph 3, the slope is decreasing. This shows that the population of fish rose rapidly at first, and then rose more and more slowly.
In table X, the increase of number of fish was 6000 in the first year, 2000 in the second year, and 1000 in the third year.

(c)
The answers: Graph 1 and Table Y
In Graph 1, the slope is constant. This shows that the population of the fish rose at a steady rate.
In Table Y, the increase in number of fish is 3000 in each year.

Add a column to each table: change in number of fish since previous year.
The first row will be blank; each subsequent row is found by subtraction. For example, this column in table X is {6000, 2000, 1000}

Compare these tables against the descriptions a-c.

Graph 1: C: Table Y

Graph 2: A: Table Z

Graph 3: B: Table X