Data? I need the data! Not trying to provoke, but in order to answer this I need data...
Answer:
Step-by-step explanation:
Sum of first n terms = 243

The slope is -½, and the y intercept would be (0, -5/2)
4:3
x:39
We need to find what 3 was multiplied by to get 39:
39/3 = 13.
Now multiply 4 by this number
4*13 = 52
Hope this helped!