Mathematical models are helpful. Advantages include helping you see the data clearer and helping you visualize. Disadvantages are: time consuming, and if you make a mistake on the graph, its going to hit the entre thing.
Step-by-step explanation:

[tex] - 24 \div 4 = \\ \frac{ - 24}{4} \\ = \frac{ - 12}{2} \\ = /frac{-6}{1}
The answer is (3,-4). On a graph you see it is right in the middle. Hope this helps.
Each term after the first is obtained by multiplying the previous one by -3 so the answer is -81 , 243