Need help understanding questions

I need help understanding these questions:

It asks to derive the mathematical models, using my calculator I achieve these answers by plotting points, sketching the graph and find the LinearReg (y=ax+b)

a = 28.6857142

b = -20.387600493

r = 0.87600493

r2 = 0.76738464

So y = 28.6857142x + -20.387600493

The exponential graph (y = a**e**bx)

a = 4.73037226

b = 0.69703135

r = 0399017859

r2 = 0.98045364

*The question then asks - (*__By considering the value of__ r2 __comment on the suitability)__.

What I said is that the closer r2 is to 1 the more suitable it is. The exponential is very suitable, whereas the Linear function is less suitable than the exponential function but still suitable.

When it asks derive the following, does it want me to derive the answers or just figure it out using the calculator – but then asks us to comment on the suitability (Are my results correct)?

Here are the tables:

TABLE 1

Number of seasons \ Population Number

0 4

1 12

2 22

3 30

4 74

5 166

TABLE 2

Number of seasons \ Population Number

0 134

1 61

2 24

3 10

4 5

5 2

6 0