An answer with a reasonable response will get brainiest. It is in the picture

Answer:
M = 12.5
Step-by-step explanation:
Simple,
2 times 12.5 is 25
4 times 12.5 is 50
6 times 12.5 is 75
8 times 12.5 is 100
The "m" is just a variable. Kinda like a question mark.