F(3) = 16, you simply plug in 3 for x to find the answer.
Answer:

Step-by-step explanation:
(
)
Multiply
by each term in the parentheses.
+ 
Now, all you have to do is simplify.

I don't know the answer but nice computer
Answer: It is possible to draw different lines to approximate the same data. The line of best fit is only an estimate.