Answer:

-10416
Step-by-step explanation:
a = 4
r = -5
geometric series: 
Determine which term = -12500:








Using geometric sum series formula: 
Therefore, 
Answer: k=11
Step-by-step explanation:
Absolute Zero, also I suggest cropping out your name and teacher for your safety :3 have an amazing day!
Answer:
160%
Step-by-step explanation: