Answer:
You can't do that. There is no answer
The answer is C, because 2 shapes can have the same area, but that doesn't necessarily mean they're congruent.
Answer: (3, -2)
Step-by-step explanation: graphed both of em on desmos and thats the intersection.
The sum will be:
sigma(i = 1 to infinity, 30*(2/5)^i)
->

Which is equal to 30/(3/5) = 50