Q1. The limit from the right is -4. (The limit from the left, and the value of f(3) are different, but that doesn't matter for the question asked. Taken together, they mean that the limit as x approaches 3 does not exist. But that is not the question asked.)
Q2. f(x) = 4/x.
f'(x) = -4/x^2, so f'(2) = -4/2^2 = -1.
Q3. Since the denominator is zero at x=7, the only answer choice that makes any sense is the first one:
-∞; x = 7
It also happens to be the right one.
The answer is 125. That is because thats the Answer.
Okay so Sam has completed 5/13 of the crossword puzzle and wants to do 8/13.
So we need to find out how many more she wants to do.
8/13-5/13=3/13
She has 3/13 has to complete.
Answer:
A democratic country has a system of government in which the people have the power to participate in decision-making. ... In some democracies citizens help make decisions directly by voting on laws and policy proposals (direct democracy).
Now, let's do the same as we did for the previous one here.

notice again, how did we get 84 for the 4th element's coefficient? well 36 * 7 / 3. and so on. And you can just expand it from there.