It would be bias if Amalie just surveyed a small population of her class rather than the whole. Hope this helps!
EFG ~ LMN, if EF ~ LM, then whatever the number is for EF times whatever the others are multiplied by, you will get LM
for example:
FG (10) ~ MN (20)
if EF is (5), then LM is (10) (for you are multiplying by two.
Another example:
if FG is (100) ~ MN will be (200) (again for you are multiplying by two.
hope this helps
There were 5 times the number of hawk fans :)
we are given

we can use average rate of change formula from t=a to t=b

Here, we are given from t=1 to t=4
so, we will get formula as

now, we can plug values

now, we can simplify it

the average rate of change in the number of acres cleared for farming between t = 1 and t = 4 is 10 acres/ month.............Answer